Table 1 The Graf type and Z-score results of first US examination of 34,478 infants

34,478

107.76 (±169.36)

15,683

18,795

34,478

107.76 (±169.36)

15,683

18,795

Graf

Ia

5130 (14.88%)

117.49 (±218.81)

2615 (16.67%)

2515 (13.38%)

5272 (15.29%)

119.72 (±240.33)

2592 (16.53%)

2680 (14.26%)

Ib

25,549 (74.10%)

108.52 (±160.14)

12,045 (76.80%)

13,504 (71.85%)

26,748 (77.58%)

107.27 (±154.80)

12,424 (79.22%)

14,324 (76.21%)

IIa

1868 (5.42%)

62.83 (±185.36)

518 (3.30%)

1350 (7.18%)

1273 (3.69%)

60.69 (±164.57)

353 (2.25%)

920 (4.89%)

IIb

1717 (4.98%)

119.94 (±105.41)

475 (3.03%)

1242 (6.61%)

1079 (3.13%)

120.40 (±68.57)

299 (1.91%)

780 (4.15%)

IIc

91 (0.26%)

79.15 (±39.29)

10 (0.06%)

81 (0.43%)

53 (0.15%)

76.00 (±34.42)

4 (0.03%)

49 (0.26%)

D

50 (0.15%)

76.84 (±37.83)

3 (0.02%)

47 (0.25%)

19 (0.06%)

69.74 (±42.12)

3 (0.02%)

16 (0.09%)

III

53 (0.15%)

83.23 (±40.43)

8 (0.05%)

45 (0.24%)

20 (0.06%)

65.05 (±33.71)

4 (0.03%)

16 (0.09%)

IV

20 (0.06%)

77.00 (±42.89)

9 (0.06%)

11 (0.06%)

14 (0.04%)

91.57 (±35.75)

4 (0.03%)

10 (0.05%)

Z-level

0

30,479 (88.40%)

107.11 (±169.72)

13,748 (87.66%)

16,731 (89.02%)

30,245 (87.72%)

106.84 (172.33)

13,611 (86.79%)

16,634 (87.66%)

1

3316 (9.62%)

111.97 (±152.97)

1692 (10.79%)

1624 (8.64%)

3622 (10.51%)

114.15 (139.50)

1854 (11.82%)

1768 (9.32%)

2

485 (1.41%)

122.86 (±254.37)

195 (1.24%)

290 (15.43%)

478 (1.39%)

118.23 (195.94)

182 (1.16%)

296 (1.56%))

3

99 (0.29%)

111.16 (±134.26)

24 (0.15%)

75 (0.40%)

72 (0.21%)

120 (155.14)

19 (0.12%)

53 (0.28%)

4

47 (0.14%)

87.72 (±38.99)

9 (0.06%)

38 (0.20%)

32 (0.09%)

86.44 (37.35)

7 (0.04%)

25 (1.32%)

5

20 (0.06%)

107.3 (±44.96)

5 (0.03%)

15 (0.08%)

12 (0.03%)

108.5 (31.65)

4 (0.03%)

8 (0.04%)

NA

32 (0.09%)

84.22 (±46.03)

10 (0.06%)

22 (0.12%)

17 (0.05%)

79.59 (34.89)

6 (0.04%)

11 (0.06%)