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Table 2 Characteristics of sibling sub-sample

From: Maternal Anxiety and Infants Birthweight and Length of Gestation. A sibling design

  Count Birthweight (in grams) Gestational age (in days)
Mean SD Mean SD
n=24,960 μ=3,639.5 s=523.0 μ=280.0 s=11.3
Maternal anxiety at week 17 (score)
 1-2, Light 22,888 3,642.9 521.4 280.1 11.2
 2-3 1,571 3,602.7 538.5 279.5 11.8
 3-4, Severe 219 3,598.8 510.1 278.7 11.0
 NA 282 3,596.6 563.2 279.1 12.0
Maternal anxiety at week 30 (score)
 1-2, Light 23,836 3,642.5 519.2 280.1 11.1
 2-3 890 3,605.8 562.6 279.3 12.8
 3-4, Severe 104 3,489.5 575.4 276.6 14.6
 NA 130 3,444.3 767.5 274.0 22.3
Maternal age
 <25 2,306 3,598.8 540.8 279.1 12.0
 25-29 8,883 3,623.9 521.0 280.0 11.3
 30-34 10,265 3,655.6 517.1 280.2 11.0
 >=35 3,506 3,658.4 530.4 280.1 11.4
Partner harmony (score)
 1-2, Good 18,030 3,628.7 522.6 280.0 11.3
 2-3 5,497 3,669.9 516.2 280.3 10.9
 3-4 984 3,686.4 518.7 280.1 10.5
 4-5 198 3,698.8 549.8 278.6 13.0
 5-6, Bad 47 3,577.9 470.7 280.7 9.4
 NA 204 3,501.4 660.7 276.8 16.8
Education
 University 4y+ 6,432 3,634.1 507.0 280.5 10.9
 College/University 3y 10,958 3,641.6 523.6 280.0 11.2
 College 1-2y 2,945 3,647.4 528.8 279.8 11.7
 Secondary school 3,572 3,635.8 541.7 279.3 11.6
 NA 1,053 3,640.2 531.7 280.5 11.4
Marital status
 Married/Partner 24,420 3,640.4 522.3 280.0 11.3
 Single 540 3,596.7 548.9 278.9 11.4
Parity
 0 9,425 3,535.0 528.3 280.1 12.4
 1 11,388 3,692.1 505.2 280.1 10.3
 2 3,279 3,739.1 513.3 279.8 10.5
 3 654 3,736.3 514.2 279.5 11.2
 4 214 3,619.2 616.9 276.6 13.5
Alcohol consumption during pregnancy
 Never 21,072 3,641.0 521.0 280.0 11.2
 1+/month 97 3,602.8 559.2 281.5 13.5
 NA 3,791 3,632.0 532.8 280.0 11.5
Smoking during pregnancy
 None 23,251 3,646.5 521.3 280.0 11.2
 Sometimes 743 3,577.1 533.9 280.4 11.7
 Daily 589 3,442.7 528.1 278.6 12.0
 NA 377 3,637.3 529.2 279.9 13.0
Birth complication
 No 17,519 3,662.7 528.6 280.5 11.5
 Yes 7,441 3,584.8 505.3 279.0 10.7
Child sex
 Girl 12,172 3,579.4 504.2 279.5 10.9
 Boy 12,788 3,696.7 534.0 280.5 11.6
 NA 24,164 3,650.9 507.5 280.3 10.8
Preeclampsia
 Yes 796 3,292.1 796.2 270.8 18.8
 No 22,888 3,642.9 521.4 280.1 11.2