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. Author manuscript; available in PMC: 2013 Nov 18.
Published in final edited form as: Paediatr Perinat Epidemiol. 2009 Sep;23(5):10.1111/j.1365-3016.2009.01061.x. doi: 10.1111/j.1365-3016.2009.01061.x

Table 1.

Descriptive statistics for the New York women’s birth cohort by baseline parental and childhood characteristics stratified by participation in adult follow-up

Eligible pool
Non-participants
Participants
n Mean SD n Mean SD n Mean SD P-value
Parental characteristics
  Maternal age at enrolment 841 25.80 5.98 579 25.56 5.93 262 26.33 6.05 0.08
  Paternal age at enrolment 732 29.73 7.81 494 29.59 7.86 238 30.03 7.74 0.48
  Maternal age at menarche 836 12.88 1.67 574 12.85 1.73 262 12.95 1.56 0.43
  Maternal pre-pregnant BMI (kg/m2) 756 22.55 4.07 516 22.56 4.24 240 22.53 3.68 0.93
  Maternal weight gain (kg) 776 10.48 4.87 528 10.47 4.83 248 10.51 4.97 0.91
  Gestation at delivery (weeks) 841 39.29 3.00 579 39.21 3.18 262 39.48 2.57 0.20
  Parity at enrolment 813 1.18 1.40 554 1.16 1.40 259 1.22 1.41 0.54
  Family SES index (registration) 787 51.34 17.34 537 49.98 17.13 250 54.28 17.46 <0.01
  Family SES index (age 7) 812 49.72 20.24 564 47.90 19.87 248 53.86 20.51 <0.0001

% % %

Maternal social security number
  Available 268 31.9 156 26.9 112 42.7 <0.0001
  Not available 573 68.1 423 73.1 150 57.3
Maternal education (years)
  <12 414 51.2 296 53.8 118 45.6 <0.01
  12 329 40.7 219 39.8 110 42.5
  >12 66 8.2 35 6.4 31 12.0
Paternal education (years)
  <12 325 49.6 234 53.1 91 42.5 <0.05
  12 248 37.9 156 35.4 92 43.0
  >12 82 12.5 51 11.6 31 14.5
Marital status
  Single 52 6.2 36 6.2 16 6.1 0.49
  Married or living as married 753 89.5 515 89.0 238 90.8
  No longer marrieda 36 4.3 28 4.8 8 3.1
Maternal race
  White 236 28.1 137 23.7 99 37.8 <0.001b
  Black 361 42.9 259 44.7 102 38.9
  Puerto Rican 234 27.8 173 29.9 61 23.3
  Other (Asian, other) 10 1.2 10 1.7 0 0.0
Year of birth
  1959 133 15.8 85 14.7 48 18.3 0.02
  1960 176 20.9 137 23.7 39 14.9
  1961 200 23.8 143 24.7 57 21.8
  1962 218 25.9 140 24.2 78 29.8
  1963 114 13.6 74 12.8 40 15.3
Maternal breast feeding
  Breast 2 0.3 1 0.2 1 0.5 0.23
  Bottle 504 81.0 356 82.6 148 77.5
  Both 116 18.7 74 17.2 42 22.0
Maternal pre-eclampsia
  Yes 68 8.2 47 8.2 21 8.1 0.99
  Possibly 85 10.2 59 10.3 26 10.0
  No 680 81.6 467 81.5 213 81.9
Maternal smoking
  Never 428 51.8 301 53.0 127 49.2 0.32
  Ever 398 48.2 267 47.0 131 50.8
Childhood anthropometry, birth to age 7
Birth
  Placental weight (g) 711 446.98 92.10 492 444.48 91.88 219 452.60 92.56 0.28
  Birthweight (g) 841 3126.93 488.40 579 3122.00 488.43 262 3137.81 489.09 0.66
  Length at birth (cm) 831 49.94 2.36 572 49.93 2.41 259 49.98 2.27 0.76
4 months
  Weight (g) 812 6138.00 776.79 553 6154.66 774.88 259 6102.40 781.15 0.37
  Length (cm) 815 61.55 2.80 556 61.51 2.77 259 61.61 2.87 0.64
1 year
  Weight (kg) 794 9.66 1.22 539 9.69 1.27 255 9.60 1.09 0.26
  Height (cm) 811 74.01 3.55 556 74.10 3.74 255 73.81 3.07 0.24
3 years
  Weight (kg) 448 14.91 2.14 290 14.97 2.20 158 14.80 2.03 0.42
  Height (cm) 441 94.87 3.82 284 95.01 3.85 157 94.60 3.76 0.27
4 years
  Weight (kg) 602 17.16 3.07 416 17.24 3.20 186 16.96 2.76 0.27
  Height (cm) 602 103.24 4.35 416 103.28 4.38 186 103.15 4.27 0.73
7 years
  Weight (kg) 841 24.32 5.34 579 24.53 5.51 262 23.87 4.93 0.08
  Height (cm) 835 122.03 5.63 575 122.21 5.77 260 121.64 5.28 0.18
a

Widowed, divorced, or separated.

b

P-value for White, Black and Puerto Rican only.

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