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Table 3 Responders and non-respondersa to the question about binge drinking

From: Alcohol consumption and binge drinking in early pregnancy. A cross-sectional study with data from the Copenhagen Pregnancy Cohort

Characteristics Responding, n (%) Missing, n (%) P-value
Maternal age (years)
<24 97 (3) 37 (5)  
25-29 774 (24) 208 (26)  
30-34 1363 (42) 311 (39)  
35-39 789 (24) 187 (24)  
≥40 215 (7) 50 (6) 0.081
Parity
Nulliparous 1960 (61) 499 (63)  
Multiparous 1278 (39) 294 (37) 0.215
Danish language skills
Yes 3068 (96) 755 (96)  
No 132 (4) 28 (4) 0.483
Cohabitation
Yes 2949 (93) 716 (92)  
No 236 (7) 63 (8) 0.521
Education    
Compulsory school 194 (7) 56 (8)  
Skilled 106 (4) 23 (3)  
Tertitary 210 (7) 48 (7)  
Bachelor or equivalent 897 (31) 220 (34)  
Master or equivalent 1451 (51) 308 (47) 0.321
Occupation
Working 2066 (71) 454 (68)  
Unemployed 166 (6) 41 (6)  
Student 464 (16) 129 (19)  
Otherb 206 (7) 46 (7) 0.204
BMI (kg/m 2 )
Underweight (<18.5) 154 (5) 35 (5)  
 Normal (18.5-24.9) 2291 (77) 518 (76)  
 Overweight (25–29.9) 398 (14) 93 (14)  
 Obese (>30) 126 (4) 36 (5) 0.689
 Mean (SD) 23 (4)   
Chronic illness
 Yes 272 (9) 64 (9)  
No 2399 (82) 594 (84)  
Other illness c 255 (9) 51 (7) 0.399
Miscarriage
Yes 654 (20) 150 (19)  
No 2584 (80) 643 (81) 0.418
Time to pregnancy, months
0-2 1708 (56) 434 (61)  
3-11 935 (30) 195 (27)  
≥12 428 (14) 83 (12) 0.031
Pregnancy planning
Very planned 1462 (47) 288 (40)  
Fairly planned 885 (29) 202 (28)  
Neither planned nor unplanned 486 (16) 160 (22)  
Fairly unplanned 116 (4) 38 (5)  
Very unplanned 134 (4) 34 (5) 0.000
Assisted reproductive technology (ART)
Yes 402 (13) 74 (10)  
No 2672 (87) 648 (90) 0.039
Exercice
Yes 2019 (70) 475 (71)  
No 859 (30) 189 (28) 0.514
Alcohol before pregnancy, no of units/week
0 960 (30) 17 (13)  
1 580 (18) 23 (18)  
2-7 1507 (47) 74 (58)  
≥8 178 (5) 14 (11) 0.000
Smoking before pregnancy
Yes 309 (10) 87 (11)  
No 2894 (90) 692 (89) 0.203
  1. aIncluding those who answered ‘don’t know’
  2. b Including stay at home, pensioners, maternity leave
  3. c E.g: asthma, polycystic ovary syndrome, migraine