Sex
  
p

Male fetus, % (N)

50.62 (31,760)

51.63 (21,242)

0.0014

Gestational age
   
Mean GA (sd), wks

39.0 (1.6)

38.2 (2.6)

<.0001

GA<37 weeks, % (N)

4.55 (2,856)

9.96 (4,099)

<.0001

GA<33 weeks, % (N)

0.53 (334)

2.65 (1,092)

<.0001

5^{th}95^{th} percentile, wks

37–41

35–41
 
Birth weight
   
Mean weight (sd), g.
 
3,282 (641)

<.0001

5^{th}95^{th} percentile, g

2695–4270

2265–4170
 
Birth length
   
Mean length (sd), cm

50.4 (2.5)

49.5 (3.7)

<.0001

5^{th}95^{th} percentile, cm

46–54

45–54
 
Birth head circumference
   
Mean circumference, cm

34.7 (1.6)

34.2 (2.4)

<.0001

5^{th}95^{th} percentile, cm

32–37

31–37
 
Maternal characteristics
   
Mean height, cm

165.1 (6.7)

164.7 (6.7)

<.0001

5^{th}95^{th} percentile, cm

154–176

153–176
 
Mean age, y

29.4 (5.2)

28.5 (5.7)

<.0001

5^{th}95^{th} percentile, y

20–38

19–38
 
Socioeconomic Disadvantage†

1009.3 (78.8)

984.7 (86.0)

<.0001
