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TABLE 1

Frequencies for Each of the Responses and Missing Data for Categorical Predictor, Control, and Outcome Variables Before Data Imputation (N = 5107)

VariableN (%)
Sex of child  
 Male 2608 (51.1) 
 Female 2499 (48.9) 
 Missing 0 (0.0) 
Wave 1 child still breastfeeding  
 Yes 2007 (39.3) 
 No 3096 (60.6) 
 Missing 4 (0.1) 
Child was breastfed at any time  
 Yes 4685 (91.7) 
 No 418 (8.2) 
 Missing 4 (0.1) 
Mother’s trimester 1 d per wk drinking alcohol  
 0 or occasional 3934 (77) 
 1 141 (2.8) 
 2 85 (1.7) 
 3 32 (0.6) 
 4 17 (0.3) 
 5 12 (0.2) 
 6 5 (0.1) 
 7 4 (0.1) 
 Missing 877 (17.2) 
Mother’s trimester 2 d per wk drinking alcohol  
 0 or occasional 3823 (74.9) 
 1 206 (4.0) 
 2 118 (2.3) 
 3 48 (0.9) 
 4 19 (0.4) 
 5 9 (0.2) 
 6 5 (0.1) 
 7 3 (0.1) 
 Missing 876 (17.2) 
Mother’s trimester 3 d per wk drinking alcohol  
 0 or occasional 3802 (74.4) 
 1 190 (3.7) 
 2 133 (2.6) 
 3 54 (1.1) 
 4 24 (0.5) 
 5 14 (0.3) 
 6 6 (0.1) 
 7 5 (0.1) 
 Missing 879 (17.2) 
Pregnancy: average No. drinks on drinking d  
 0 or none 2597 (50.9) 
 1 or 2 1560 (30.5) 
 3 or 4 56 (1.1) 
 5 or 6 7 (0.1) 
 7–10 3 (0.1) 
 11 or more 5 (0.1) 
 Missing 879 (17.2) 
Mother’s level of education  
 Never attended or still attending school 4 (0.1) 
 ≤Year 8 83 (1.6) 
 Year 9 or Eq 161 (3.2) 
 Year 10 or Eq 820 (16.1) 
 Year 11 or Eq 539 (10.6) 
 Year 12 or Eq 1813 (35.5) 
 Bachelor degree 998 (19.5) 
 Graduate diploma or certificate 319 (6.2) 
 Postgraduate degree 361 (7.1) 
 Missing 9 (0.2) 
Combined family income (Australian dollars)  
 ≥$2400 per wk or ≥$124 800 per y 384 (7.5) 
 $2200–$2399 per wk or $114 400–$124 799 per y 106 (2.1) 
 $2000–$2199 per wk or $104 000–$114 399 per y 158 (3.1) 
 $1500–$1999 per wk or $78 000–$103 999 per y 674 (13.2) 
 $1000–$1499 per wk or $52 000–$77 999 per y 1295 (25.4) 
 $800–$999 per wk or $41 600–$51 999 per y 685 (13.4) 
 $700–$799 per wk or $36 400–$41 599 per y 367 (7.2) 
 $600–$699 per wk or $31 200–$36 399 per y 287 (5.6) 
 $500–$599 per wk or $26 000–$31 199 per y 266 (5.2) 
 $400–$499 per wk or $20 800–$25 999 per y 273 (5.3) 
 $300–$399 per wk or $15 600–$20 799 per y 231 (4.5) 
 $200–$299 per wk or $10 400–$15 599 per y 78 (1.5) 
 $100–$199 per wk or $5200–$10 399 per y 17 (0.3) 
 $50–$99 per wk or $2600–$5199 per y 7 (0.1) 
 $1–$49 per wk or $1–$2599 per y 1 (<0.1) 
 Nil income 2 (<0.1) 
 Negative income 4 (0.1) 
 Missing 272 (5.3) 
Mother’s frequency of drinking alcohol (modified AUDIT-C question 1)  
 Never 387 (7.6) 
 Not in the last y 414 (8.1) 
 Monthly or less 1234 (24.2) 
 2–3 times a mo 582 (11.4) 
 Once a wk 590 (11.6) 
 2–3 times a wk 604 (11.8) 
 4–6 times a wk 303 (5.9) 
 Every d 91 (1.8) 
 Missing 902 (17.7) 
Mother’s average No. drinks when drinking (modified AUDIT-C question 2)  
 0 387 (7.6) 
 1 or 2 2484 (48.6) 
 3 or 4 611 (12.0) 
 5 or 6 184 (3.6) 
 7–10 64 (1.3) 
 ≥11 17 (0.3) 
 Missing 1360 (26.6) 
Mother’s frequency of drinking ≥5 drinks in 1 sitting (modified AUDIT-C question 3)  
 Not in the last y 2879 (56.4) 
 Monthly or less 1022 (20.0) 
 2 or 3 times a mo 148 (2.9) 
 Once a wk 95 (1.9) 
 2–3 times a wk 46 (0.9) 
 4–6 times a wk 7 (0.1) 
 Every d 1 (0.1) 
 Missing 909 (17.8) 
Head injury wave 3a  
 Yes 7 (0.1) 
 No 4379 (85.7) 
 Missing 721 (14.1) 
Head injury wave 4a  
 Yes 19 (0.4) 
 No 4223 (82.7) 
 Missing 865 (16.9) 
Head injury wave 5a  
 Yes 24 (0.5) 
 No 4024 (78.8) 
 Missing 1059 (20.7) 
Head injury wave 6a  
 Yes 28 (0.5) 
 No 3670 (71.9) 
 Missing 1409 (27.6) 
Learning difficulty wave 3  
 Yes 84 (1.6) 
 No 4302 (84.2) 
 Missing 721 (14.1) 
Learning difficulty wave 4  
 Yes 25 (0.5) 
 No 4217 (82.6) 
 Missing 865 (16.9) 
Learning difficulty wave 5  
 Yes 92 (1.8) 
 No 3955 (77.4) 
 Missing 1060 (20.8) 
Learning difficulty wave 6  
 Yes 107 (2.1) 
 No 3670 (71.9) 
 Missing 1409 (27.6) 
VariableN (%)
Sex of child  
 Male 2608 (51.1) 
 Female 2499 (48.9) 
 Missing 0 (0.0) 
Wave 1 child still breastfeeding  
 Yes 2007 (39.3) 
 No 3096 (60.6) 
 Missing 4 (0.1) 
Child was breastfed at any time  
 Yes 4685 (91.7) 
 No 418 (8.2) 
 Missing 4 (0.1) 
Mother’s trimester 1 d per wk drinking alcohol  
 0 or occasional 3934 (77) 
 1 141 (2.8) 
 2 85 (1.7) 
 3 32 (0.6) 
 4 17 (0.3) 
 5 12 (0.2) 
 6 5 (0.1) 
 7 4 (0.1) 
 Missing 877 (17.2) 
Mother’s trimester 2 d per wk drinking alcohol  
 0 or occasional 3823 (74.9) 
 1 206 (4.0) 
 2 118 (2.3) 
 3 48 (0.9) 
 4 19 (0.4) 
 5 9 (0.2) 
 6 5 (0.1) 
 7 3 (0.1) 
 Missing 876 (17.2) 
Mother’s trimester 3 d per wk drinking alcohol  
 0 or occasional 3802 (74.4) 
 1 190 (3.7) 
 2 133 (2.6) 
 3 54 (1.1) 
 4 24 (0.5) 
 5 14 (0.3) 
 6 6 (0.1) 
 7 5 (0.1) 
 Missing 879 (17.2) 
Pregnancy: average No. drinks on drinking d  
 0 or none 2597 (50.9) 
 1 or 2 1560 (30.5) 
 3 or 4 56 (1.1) 
 5 or 6 7 (0.1) 
 7–10 3 (0.1) 
 11 or more 5 (0.1) 
 Missing 879 (17.2) 
Mother’s level of education  
 Never attended or still attending school 4 (0.1) 
 ≤Year 8 83 (1.6) 
 Year 9 or Eq 161 (3.2) 
 Year 10 or Eq 820 (16.1) 
 Year 11 or Eq 539 (10.6) 
 Year 12 or Eq 1813 (35.5) 
 Bachelor degree 998 (19.5) 
 Graduate diploma or certificate 319 (6.2) 
 Postgraduate degree 361 (7.1) 
 Missing 9 (0.2) 
Combined family income (Australian dollars)  
 ≥$2400 per wk or ≥$124 800 per y 384 (7.5) 
 $2200–$2399 per wk or $114 400–$124 799 per y 106 (2.1) 
 $2000–$2199 per wk or $104 000–$114 399 per y 158 (3.1) 
 $1500–$1999 per wk or $78 000–$103 999 per y 674 (13.2) 
 $1000–$1499 per wk or $52 000–$77 999 per y 1295 (25.4) 
 $800–$999 per wk or $41 600–$51 999 per y 685 (13.4) 
 $700–$799 per wk or $36 400–$41 599 per y 367 (7.2) 
 $600–$699 per wk or $31 200–$36 399 per y 287 (5.6) 
 $500–$599 per wk or $26 000–$31 199 per y 266 (5.2) 
 $400–$499 per wk or $20 800–$25 999 per y 273 (5.3) 
 $300–$399 per wk or $15 600–$20 799 per y 231 (4.5) 
 $200–$299 per wk or $10 400–$15 599 per y 78 (1.5) 
 $100–$199 per wk or $5200–$10 399 per y 17 (0.3) 
 $50–$99 per wk or $2600–$5199 per y 7 (0.1) 
 $1–$49 per wk or $1–$2599 per y 1 (<0.1) 
 Nil income 2 (<0.1) 
 Negative income 4 (0.1) 
 Missing 272 (5.3) 
Mother’s frequency of drinking alcohol (modified AUDIT-C question 1)  
 Never 387 (7.6) 
 Not in the last y 414 (8.1) 
 Monthly or less 1234 (24.2) 
 2–3 times a mo 582 (11.4) 
 Once a wk 590 (11.6) 
 2–3 times a wk 604 (11.8) 
 4–6 times a wk 303 (5.9) 
 Every d 91 (1.8) 
 Missing 902 (17.7) 
Mother’s average No. drinks when drinking (modified AUDIT-C question 2)  
 0 387 (7.6) 
 1 or 2 2484 (48.6) 
 3 or 4 611 (12.0) 
 5 or 6 184 (3.6) 
 7–10 64 (1.3) 
 ≥11 17 (0.3) 
 Missing 1360 (26.6) 
Mother’s frequency of drinking ≥5 drinks in 1 sitting (modified AUDIT-C question 3)  
 Not in the last y 2879 (56.4) 
 Monthly or less 1022 (20.0) 
 2 or 3 times a mo 148 (2.9) 
 Once a wk 95 (1.9) 
 2–3 times a wk 46 (0.9) 
 4–6 times a wk 7 (0.1) 
 Every d 1 (0.1) 
 Missing 909 (17.8) 
Head injury wave 3a  
 Yes 7 (0.1) 
 No 4379 (85.7) 
 Missing 721 (14.1) 
Head injury wave 4a  
 Yes 19 (0.4) 
 No 4223 (82.7) 
 Missing 865 (16.9) 
Head injury wave 5a  
 Yes 24 (0.5) 
 No 4024 (78.8) 
 Missing 1059 (20.7) 
Head injury wave 6a  
 Yes 28 (0.5) 
 No 3670 (71.9) 
 Missing 1409 (27.6) 
Learning difficulty wave 3  
 Yes 84 (1.6) 
 No 4302 (84.2) 
 Missing 721 (14.1) 
Learning difficulty wave 4  
 Yes 25 (0.5) 
 No 4217 (82.6) 
 Missing 865 (16.9) 
Learning difficulty wave 5  
 Yes 92 (1.8) 
 No 3955 (77.4) 
 Missing 1060 (20.8) 
Learning difficulty wave 6  
 Yes 107 (2.1) 
 No 3670 (71.9) 
 Missing 1409 (27.6) 
a

Head injuries noted at earlier waves were automatically recorded at all later waves.

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