Clinical or Sonographic Parameter | Variability Estimate (2 SD) |
---|---|
In vitro fertilization * | ±1 day |
Ovulation induction * | ±3 days |
Artificial insemination * | ±3 days |
Single intercourse record * | ±3 days |
Basal body temperature record * | ±4 days |
First trimester physical examination | ±2 weeks |
Second trimester physical examination | ±4 weeks |
Third trimester physical examination | ±6 weeks |
First trimester sonographic examination (CRL) | ±8% of the estimate |
Second trimester sonographic examination (HC, FL) | ±8% of the estimate |
Third trimester sonographic examination (HC, FL) | ±8% of the estimate |
* Indicators of conceptual age (menstrual age = conceptual age + 14 days).
Gestational Age (wk) | Structure First Appears on Ultrasound * | Mean Sac Diameter (mm) 8 | Crown-Rump Length (mm) 10 |
---|---|---|---|
5.0 | Gestational sac | 2 | — |
5.5 | Yolk sac | 6 | — |
6.0 | Embryo with heartbeat | 10 | 3 |
6.5 | 14 | 6 | |
7.0 | Amnion | 18 | 10 |
7.5 | 22 | 13 | |
8.0 | 26 | 16 |
* ±0.5 week age range for first visibility of each structure.
Stage of Pregnancy | Basis for GA | Accuracy (wks) * |
---|---|---|
First Trimester | ||
Early (5-6 weeks) | Sonographic milestones or MSD | ±0.5 ±0.5 |
Mid to late (6-13 weeks) | CRL | ±0.5-1.0 |
Second Trimester | ||
If OFD measurable | BPDc or HC | ±1.2 (14-20 wks) ±1.9 (20-26 wks) |
If OFD not measurable | BPD or FL | ±1.4 (14-20 wks) ±2.1-2.5 (20-26 wks) |
Third Trimester | ||
If OFD measurable | BPDc, HC, or FL | ±3.1-3.4 (26-32 wks) ±3.5-3.8 (32-42 wks) |
If OFD not measurable | FL | ±3.1 (26-32 wks) ±3.5 (36-42 wks) |
Parameter | VARIABILITY (2 SD) | |||
---|---|---|---|---|
Hadlock et al * | Rossavik and Fishburne † | Persson and Weldner ‡ | Benson and Doubilet § | |
BPD | 0.94 wk | 1.02 wk | 0.92 wk | 1.40 wk |
HC | 0.84 wk | 0.92 wk | ND | 1.20 wk |
AC | 1.04 wk | 1.12 wk | ND | 2.10 wk |
FL | 0.96 wk | ND | 0.98 wk | 1.40 wk |
BPD, FL | 0.80 wk | ND | 0.78 wk | ND |
HC, FL | 0.76 wk | ND | ND | ND |
* Data from Hadlock FP, Harrist RB, Martinez-Poyer J: How accurate is second trimester fetal dating? J Ultrasound Med 10:557, 1992.
† Data from Rossavik IK, Fishburne JI: Conceptional age, menstrual age, and ultrasound age: a second trimester comparison of pregnancies of known conception date with pregnancies dated from the last menstrual period. Obstet Gynecol 73:243, 1989.
‡ Data from Persson PH, Weldner BM: Reliability of ultrasound fetometry in estimating gestational age in the second trimester. Acta Obstet Gynecol Scand 65:481, 1986.
§ Data from Benson CB, Doubilet PM: Sonographic prediction of gestational age: accuracy of second and third trimester fetal measurements. Am J Roentgenol 157:1275, 1991.
Parameter | VARIABILITY IN WEEKS (±2 SD) | |||
---|---|---|---|---|
14-20 Weeks | 20-26 Weeks | 26-32 Weeks | 32-42 Weeks | |
BPD | 1.4 | 2.1 | 3.8 | 4.1 |
Corrected BPD | 1.2 | 1.9 | 3.3 | 3.8 |
HC | 1.2 | 1.9 | 3.4 | 3.8 |
AC | 2.1 | 3.7 | 3.0 | 4.5 |
FL | 1.4 | 2.5 | 3.1 | 3.5 |
Parameter | VARIABILITY IN WEEKS (±2 SD) | ||||
---|---|---|---|---|---|
12-18 Weeks | 18-24 Weeks | 24-30 Weeks | 30-36 Weeks | 36-42 Weeks | |
Binocular distance * | 1.8 | 2.4 | 3.0 | 4.0 | 4.0 |
Cerebellar diameter † | 1.0 | 1.8 | 2.0 | 2.4 | 3.2 |
Clavicle length ‡ | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 |
Radius length § | 1.8 | 2.2 | 2.9 | 3.5 | 4.1 |
Ulna length || | 3.6 | 3.6 | 3.6 | 3.6 | 3.6 |
Tibia length || | 3.5 | 3.5 | 3.5 | 3.5 | 3.5 |
Foot length ¶ | 1.2 | 1.7 | 2.2 | 2.6 | 3.1 |
* Data from Jeanty P, Cantraine F, Cousaert E, et al: The binocular distance: a new way to estimate fetal age. J Ultrasound Med 3:241, 1984.
† Data from Hill LM: Transverse cerebellar diameter as a predictor of menstrual age. Obstet Gynecol 75:983, 1990.
‡ Data from Yarkoni S, Schmidt W, Jeanty P, et al: Clavicular measurement: a new biometric parameter for fetal evaluation. J Ultrasound Med 4:467, 1985.
§ Data from Hill LM, Guzick D, Thomas ML, et al: Fetal radius length: a critical evaluation of race as a factor in gestational age assessment. Am J Obstet Gynecol 161:193, 1989.
|| Data from Jeanty P, Rodesch F, Delbeke D: Estimation of fetal age by long bone measurements. J Ultrasound Med 3:75, 1984.
¶ Data from Mercer BM, Sklar S, Shariatmadar A, et al: Fetal foot length as a predictor of gestational age. Am J Obstet Gynecol 15:350, 1987.
Mean Predicted Gestational Sac (cm) | Gestational Age (wk) | Mean Predicted Gestational Sac (cm) | Gestational Age (wk) |
---|---|---|---|
1.0 | 5.0 | 3.6 | 8.8 |
1.1 | 5.2 | 3.7 | 8.9 |
1.2 | 5.3 | 3.8 | 9.0 |
1.3 | 5.5 | 3.9 | 9.2 |
1.4 | 5.6 | 4.0 | 9.3 |
1.5 | 5.8 | 4.1 | 9.5 |
1.6 | 5.9 | 4.2 | 9.6 |
1.7 | 6.0 | 4.3 | 9.7 |
1.8 | 6.2 | 4.4 | 9.9 |
1.9 | 6.3 | 4.5 | 10.0 |
2.0 | 6.5 | 4.6 | 10.2 |
2.1 | 6.6 | 4.7 | 10.3 |
2.2 | 6.8 | 4.8 | 10.5 |
2.3 | 6.9 | 4.9 | 10.6 |
2.4 | 7.0 | 5.0 | 10.7 |
2.5 | 7.2 | 5.1 | 10.9 |
2.6 | 7.3 | 5.2 | 11.0 |
2.7 | 7.5 | 5.3 | 11.2 |
2.8 | 7.6 | 5.4 | 11.3 |
2.9 | 7.8 | 5.5 | 11.5 |
3.0 | 7.9 | 5.6 | 11.6 |
3.1 | 8.0 | 5.7 | 11.7 |
3.2 | 8.2 | 5.8 | 11.9 |
3.3 | 8.3 | 5.9 | 12.0 |
3.4 | 8.5 | 6.0 | 12.2 |
3.5 | 8.6 |
Menstrual Age (days) | Menstrual Age (wk) | Gestational Sac Size (mm) | Crown-Rump Length (cm) | HCG LEVEL (FIRST IRP) | |
---|---|---|---|---|---|
Mean (U/L) | Range (U/L) | ||||
30 | 4.3 | ||||
31 | 4.4 | ||||
32 | 4.6 | 3 | 1710 | (1050-2800) | |
33 | 4.7 | 4 | 2320 | (1440-3760) | |
34 | 4.9 | 5 | 3100 | (1940-4980) | |
35 | 5.0 | 5.5 | 4090 | (2580-6530) | |
36 | 5.1 | 6 | 5340 | (3400-8450) | |
37 | 5.3 | 7 | 6880 | (4420-10,810) | |
38 | 5.4 | 8 | 8770 | (5680-13,660) | |
39 | 5.6 | 9 | 11,040 | (7220-17,050) | |
40 | 5.7 | 10 | 0.2 | 13,730 | (9050-21,040) |
41 | 5.9 | 11 | 0.3 | 15,300 | (10,140-23,340) |
42 | 6.0 | 12 | 0.35 | 16,870 | (11,230-25,640) |
43 | 6.1 | 13 | 0.4 | 20,480 | (13,750-30,880) |
44 | 6.3 | 14 | 0.5 | 24,560 | (16,650-36,750) |
45 | 6.4 | 15 | 0.6 | 29,110 | (19,910-43,220) |
46 | 6.6 | 16 | 0.7 | 34,100 | (25,530-50,210) |
47 | 6.7 | 17 | 0.8 | 39,460 | (27,470-57,640) |
48 | 6.9 | 18 | 0.9 | 45,120 | (31,700-65,380) |
49 | 7.0 | 19 | 0.95 | 50,970 | (36,130-73,280) |
50 | 7.1 | 20 | 1.0 | 56,900 | (40,700-81,150) |
51 | 7.3 | 21 | 1.1 | 62,760 | (45,300-88,790) |
52 | 7.4 | 22 | 1.2 | 68,390 | (49,810-95,990) |
53 | 7.6 | 23 | 1.3 | 73,640 | (54,120-102,540) |
54 | 7.7 | 24 | 1.4 | 78,350 | (58,100-108,230) |
55 | 7.9 | 25 | 1.5 | 82,370 | (61,640-112,870) |
56 | 8.0 | 26 | 1.6 | 85,560 | (64,600-116,310) |
57 | 8.1 | 26.5 | 1.7 | ||
58 | 8.3 | 27 | 1.8 | ||
59 | 8.4 | 28 | 1.9 | ||
60 | 8.6 | 29 | 2.0 | ||
61 | 8.7 | 30 | 2.1 | ||
62 | 8.9 | 31 | 2.2 | ||
63 | 9.0 | 32 | 2.3 | ||
64 | 9.1 | 33 | 2.4 | ||
65 | 9.3 | 34 | 2.5 | ||
66 | 9.4 | 35 | 2.6 | ||
67 | 9.6 | 36 | 2.8 | ||
68 | 9.7 | 37 | 2.9 | ||
69 | 9.9 | 38 | 3.0 | ||
70 | 10.0 | 39 | 3.1 | ||
71 | 10.1 | 40 | 3.2 | ||
72 | 10.3 | 41 | 3.4 | ||
73 | 10.4 | 42 | 3.5 | ||
74 | 10.6 | 43 | 3.7 | ||
75 | 10.7 | 44 | 3.8 | ||
76 | 10.9 | 45 | 4.0 | ||
77 | 11.0 | 46 | 4.1 | ||
78 | 11.1 | 47 | 4.2 | ||
79 | 11.3 | 48 | 4.4 | ||
80 | 11.4 | 49 | 4.6 | ||
81 | 11.6 | 50 | 4.8 | ||
82 | 11.7 | 51 | 5.0 | ||
83 | 11.9 | 52 | 5.2 | ||
84 | 12.0 | 53 | 5.4 |
* Data from Daya S, Woods S: Transvaginal ultrasound scanning in early pregnancy and correlation with human chorionic gonadotropin levels. J Clin Ultrasound 19:139, 1991; Hadlock FP, Shah YP, Kanon DJ, et al: Fetal crown rump length: reevaluation of relation to menstrual age (5-18 weeks) with high-resolution real-time US. Radiology 182:501, 1992; and Robinson HP: “Gestation sac” volumes as determined by sonar in the first trimester of pregnancy. Br J Obstet Gynaecol 82:100, 1975.
CRL | MA | CRL | MA | CRL | MA |
---|---|---|---|---|---|
0.2 | 5.7 | 4.2 | 11.1 | 8.2 | 14.2 |
0.3 | 5.9 | 4.3 | 11.2 | 8.3 | 14.2 |
0.4 | 6.1 | 4.4 | 11.2 | 8.4 | 14.3 |
0.5 | 6.2 | 4.5 | 11.3 | 8.5 | 14.4 |
0.6 | 6.4 | 4.6 | 11.4 | 8.6 | 14.5 |
0.7 | 6.6 | 4.7 | 11.5 | 8.7 | 14.6 |
0.8 | 6.7 | 4.8 | 11.6 | 8.8 | 14.7 |
0.9 | 6.9 | 4.9 | 11.7 | 8.9 | 14.8 |
1.0 | 7.2 | 5.0 | 11.7 | 9.0 | 14.9 |
1.1 | 7.2 | 5.1 | 11.8 | 9.1 | 15.0 |
1.2 | 7.4 | 5.2 | 11.9 | 9.2 | 15.1 |
1.3 | 7.5 | 5.3 | 12.0 | 9.3 | 15.2 |
1.4 | 7.7 | 5.4 | 12.0 | 9.4 | 15.3 |
1.5 | 7.9 | 5.5 | 12.1 | 9.5 | 15.3 |
1.6 | 8.0 | 5.6 | 12.2 | 9.6 | 15.4 |
1.7 | 8.1 | 5.7 | 12.3 | 9.7 | 15.5 |
1.8 | 8.3 | 5.8 | 12.3 | 9.8 | 15.6 |
1.9 | 8.4 | 5.9 | 12.4 | 9.9 | 15.7 |
2.0 | 8.6 | 6.0 | 12.5 | 10.0 | 15.9 |
2.1 | 8.7 | 6.1 | 12.6 | 10.1 | 16.0 |
2.2 | 8.9 | 6.2 | 12.6 | 10.2 | 16.1 |
2.3 | 9.0 | 6.3 | 12.7 | 10.3 | 16.2 |
2.4 | 9.1 | 6.4 | 12.8 | 10.4 | 16.3 |
2.5 | 9.2 | 6.5 | 12.8 | 10.5 | 16.4 |
2.6 | 9.4 | 6.6 | 12.9 | 10.6 | 16.5 |
2.7 | 9.5 | 6.7 | 13.0 | 10.7 | 16.6 |
2.8 | 9.6 | 6.8 | 13.1 | 10.8 | 16.7 |
2.9 | 9.7 | 6.9 | 13.1 | 10.9 | 16.8 |
3.0 | 9.9 | 7.0 | 13.2 | 11.0 | 16.9 |
3.1 | 10.0 | 7.1 | 13.3 | 11.1 | 17.0 |
3.2 | 10.1 | 7.2 | 13.4 | 11.2 | 17.1 |
3.3 | 10.2 | 7.3 | 13.4 | 11.3 | 17.2 |
3.4 | 10.3 | 7.4 | 13.5 | 11.4 | 17.3 |
3.5 | 10.4 | 7.5 | 13.6 | 11.5 | 17.4 |
3.6 | 10.5 | 7.6 | 13.7 | 11.6 | 17.5 |
3.7 | 10.6 | 7.7 | 13.8 | 11.7 | 17.6 |
3.8 | 10.7 | 7.8 | 13.8 | 11.8 | 17.7 |
3.9 | 10.8 | 7.9 | 13.9 | 11.9 | 17.8 |
4.0 | 10.9 | 8.0 | 14.0 | 12.0 | 17.9 |
4.1 | 11.0 | 8.1 | 14.1 | 12.1 | 18.0 |
Head Circumference (cm) | Menstrual Age (wk) | Head Circumference (cm) | Menstrual Age (wk) |
---|---|---|---|
8.5 | 13.7 | 22.5 | 24.4 |
9.0 | 14.0 | 23.0 | 24.9 |
9.5 | 14.3 | 23.5 | 25.4 |
10.0 | 14.6 | 24.0 | 25.9 |
10.5 | 15.0 | 24.5 | 26.4 |
11.0 | 15.3 | 25.0 | 26.9 |
11.5 | 15.6 | 25.5 | 27.5 |
12.0 | 15.9 | 26.0 | 28.0 |
12.5 | 16.3 | 26.5 | 28.6 |
13.0 | 16.6 | 27.0 | 29.2 |
13.5 | 17.0 | 27.5 | 29.8 |
14.0 | 17.3 | 28.0 | 30.3 |
14.5 | 17.7 | 28.5 | 31.0 |
15.0 | 18.1 | 29.0 | 31.6 |
15.5 | 18.4 | 29.5 | 32.2 |
16.0 | 18.8 | 30.0 | 32.8 |
16.5 | 19.2 | 30.5 | 33.5 |
17.0 | 19.6 | 31.0 | 34.2 |
17.5 | 20.0 | 31.5 | 34.9 |
18.0 | 20.4 | 32.0 | 35.5 |
18.5 | 20.8 | 32.5 | 36.3 |
19.0 | 21.2 | 33.0 | 37.0 |
19.5 | 21.6 | 33.5 | 37.7 |
20.0 | 22.1 | 34.0 | 38.5 |
20.5 | 22.5 | 34.5 | 39.2 |
21.0 | 23.0 | 35.0 | 40.0 |
21.5 | 23.4 | 35.5 | 40.8 |
22.0 | 23.9 | 36.0 | 41.6 |
VARIABILITY ESTIMATES (±2 SD) | |
---|---|
12-18 wk | ±1.3 wk |
18-24 wk | ±1.6 wk |
24-30 wk | ±2.3 wk |
30-36 wk | ±2.7 wk |
36-42 wk | ±3.4 wk |
Menstrual Weeks | HEAD CIRCUMFERENCE (CM) BY PERCENTILE | ||||
---|---|---|---|---|---|
3rd | 10th | 50th | 90th | 97th | |
14 | 8.8 | 9.1 | 9.7 | 10.3 | 10.6 |
15 | 10.0 | 10.4 | 11.0 | 11.6 | 12.0 |
16 | 11.3 | 11.7 | 12.4 | 13.1 | 13.5 |
17 | 12.6 | 13.0 | 13.8 | 14.6 | 15.0 |
18 | 13.7 | 14.2 | 15.1 | 16.0 | 16.5 |
19 | 14.9 | 15.5 | 16.4 | 17.4 | 17.9 |
20 | 16.1 | 16.7 | 17.7 | 18.7 | 19.3 |
21 | 17.2 | 17.8 | 18.9 | 20.0 | 20.6 |
22 | 18.3 | 18.9 | 20.1 | 21.3 | 21.9 |
23 | 19.4 | 20.1 | 21.3 | 22.5 | 23.2 |
24 | 20.4 | 21.1 | 22.4 | 23.7 | 24.3 |
25 | 21.4 | 22.2 | 23.5 | 24.9 | 25.6 |
26 | 22.4 | 23.2 | 24.6 | 26.0 | 26.8 |
27 | 23.3 | 24.1 | 25.6 | 27.1 | 27.9 |
28 | 24.2 | 25.1 | 26.6 | 28.1 | 29.0 |
29 | 25.0 | 25.9 | 27.5 | 29.1 | 30.0 |
30 | 25.8 | 26.8 | 28.4 | 30.0 | 31.0 |
31 | 26.7 | 27.6 | 29.3 | 31.0 | 31.9 |
32 | 27.4 | 28.4 | 30.1 | 31.8 | 32.8 |
33 | 28.0 | 29.0 | 30.8 | 32.6 | 33.6 |
34 | 28.7 | 29.7 | 31.5 | 33.3 | 34.3 |
35 | 29.3 | 30.4 | 32.2 | 34.1 | 35.1 |
36 | 29.9 | 30.9 | 32.8 | 34.7 | 35.8 |
37 | 30.3 | 31.4 | 33.3 | 35.2 | 36.3 |
38 | 30.8 | 31.9 | 33.8 | 35.8 | 36.8 |
39 | 31.1 | 32.2 | 34.2 | 36.2 | 37.3 |
40 | 31.5 | 32.6 | 34.6 | 36.6 | 37.7 |
Abdominal Circumference (cm) | Menstrual Age (wk) | Abdominal Circumference (cm) | Menstrual Age (wk) |
---|---|---|---|
10.0 | 15.6 | 23.5 | 27.7 |
10.5 | 16.1 | 24.0 | 28.2 |
11.0 | 16.5 | 24.5 | 28.7 |
11.5 | 16.9 | 25.0 | 29.2 |
12.0 | 17.3 | 25.5 | 29.7 |
12.5 | 17.8 | 26.0 | 30.1 |
13.0 | 18.2 | 26.5 | 30.6 |
13.5 | 18.6 | 27.0 | 31.1 |
14.0 | 19.1 | 27.5 | 31.6 |
14.5 | 19.5 | 28.0 | 32.1 |
15.0 | 20.0 | 28.5 | 32.6 |
15.5 | 20.4 | 29.0 | 33.1 |
16.0 | 20.8 | 29.5 | 33.6 |
16.5 | 21.3 | 30.0 | 34.1 |
17.0 | 21.7 | 30.5 | 34.6 |
17.5 | 22.2 | 31.0 | 35.1 |
18.0 | 22.6 | 31.5 | 35.6 |
18.5 | 23.1 | 32.0 | 36.1 |
19.0 | 23.6 | 32.5 | 36.6 |
19.5 | 24.0 | 33.0 | 37.1 |
20.0 | 24.5 | 33.5 | 37.6 |
20.5 | 24.9 | 34.0 | 38.1 |
21.0 | 25.4 | 34.5 | 38.7 |
21.5 | 25.9 | 35.0 | 39.2 |
22.0 | 26.3 | 35.5 | 39.7 |
22.5 | 26.8 | 36.0 | 40.2 |
23.0 | 27.3 |
VARIABILITY ESTIMATES (±2 SD) | |
---|---|
12-18 wk | ±1.9 wk |
18-24 wk | ±2.0 wk |
24-30 wk | ±2.2 wk |
30-36 wk | ±3.0 wk |
36-42 wk | ±2.5 wk |
Menstrual Age (Wks) | ABDOMINAL CIRCUMFERENCE (CM) BY PERCENTILE | ||||
---|---|---|---|---|---|
3rd | 10th | 50th | 90th | 97th | |
14 | 6.4 | 6.7 | 7.3 | 7.9 | 8.3 |
15 | 7.5 | 7.9 | 8.6 | 9.3 | 9.7 |
16 | 8.6 | 9.1 | 9.9 | 10.7 | 11.2 |
17 | 9.7 | 10.3 | 11.2 | 12.1 | 12.7 |
18 | 10.9 | 11.5 | 12.5 | 13.5 | 14.1 |
19 | 11.9 | 12.6 | 13.7 | 14.8 | 15.5 |
20 | 13.1 | 13.8 | 15.0 | 16.3 | 17.0 |
21 | 14.1 | 14.9 | 16.2 | 17.6 | 18.3 |
22 | 15.1 | 16.0 | 17.4 | 18.8 | 19.7 |
23 | 16.1 | 17.0 | 18.5 | 20.0 | 20.9 |
24 | 17.1 | 18.1 | 19.7 | 21.3 | 22.3 |
25 | 18.1 | 19.1 | 20.8 | 22.5 | 23.5 |
26 | 19.1 | 20.1 | 21.9 | 23.7 | 24.8 |
27 | 20.0 | 21.1 | 23.0 | 24.9 | 26.0 |
28 | 20.9 | 22.0 | 24.0 | 26.0 | 27.1 |
29 | 21.8 | 23.0 | 25.1 | 27.2 | 28.4 |
30 | 22.7 | 23.9 | 26.1 | 28.3 | 29.5 |
31 | 23.6 | 24.9 | 27.1 | 29.4 | 30.6 |
32 | 24.5 | 25.8 | 28.1 | 30.4 | 31.8 |
33 | 25.3 | 26.7 | 29.1 | 31.5 | 32.9 |
34 | 26.1 | 27.5 | 30.0 | 32.5 | 33.9 |
35 | 26.9 | 28.3 | 30.9 | 33.5 | 34.9 |
36 | 27.7 | 29.2 | 31.8 | 34.4 | 35.9 |
37 | 28.5 | 30.0 | 32.7 | 35.4 | 37.0 |
38 | 29.2 | 30.8 | 33.6 | 36.4 | 38.0 |
39 | 29.9 | 31.6 | 34.4 | 37.3 | 38.9 |
40 | 30.7 | 32.4 | 35.3 | 38.2 | 39.9 |
Menstrual Age (wk) | ABDOMINAL CIRCUMFERENCE (cm) | |||||
---|---|---|---|---|---|---|
10th PERCENTILE | 90th PERCENTILE | |||||
Jeanty et al * | Hadlock et al † | Tamura and Sabbagha ‡ | Jeanty et al * | Hadlock et al † | Tamura and Sabbagha ‡ | |
18 | 10.2 | 11.5 | 11.7 | 13.6 | 13.5 | 12.0 |
20 | 12.4 | 13.7 | 14.2 | 15.8 | 16.3 | 16.7 |
22 | 14.6 | 16.0 | 14.7 | 18.0 | 18.8 | 19.7 |
24 | 16.7 | 18.1 | 18.9 | 20.1 | 21.3 | 22.8 |
26 | 18.8 | 20.1 | 19.8 | 22.2 | 23.7 | 26.7 |
28 | 20.8 | 22.0 | 23.1 | 24.2 | 26.0 | 27.2 |
30 | 22.7 | 23.9 | 24.4 | 26.1 | 28.3 | 30.1 |
32 | 24.5 | 25.8 | 26.7 | 27.9 | 30.4 | 32.4 |
34 | 26.2 | 27.5 | 28.6 | 29.6 | 32.5 | 33.6 |
36 | 27.6 | 29.2 | 31.0 | 31.0 | 34.4 | 37.8 |
38 | 28.9 | 30.8 | 32.8 | 32.3 | 36.4 | 38.5 |
40 | 29.9 | 32.4 | 33.3 | 33.3 | 38.2 | 41.2 |