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Table 5 Characteristics of included infants and their parents after 3 years of recruitment, separately for all study participants and for respondents at 1-year follow-up

From: KUNO-Kids birth cohort study: rationale, design, and cohort description

  Participants at baseline (N = 2492) Respondents at 1-year follow-up (N = 784)b
Infants
 Sex (female) N (%) 2492 1223 (49.1) 784 393 (50.1)
 Weight at birth (g) M (SD) 2479 3352 (507) 776 3343 (503)
 Length at birth (cm) M (SD) 2481 51 (2.6) 777 51.4 (2.6)
 Duration of pregnancy (weeks) M (SD) 2465 39.5 (1.6) 774 39.6 (1.6)
 One or more older siblings N (%) 2475 1091 (44.0) 775 304 (39.2)
Mothers
 Maternal age (years) M (SD) 2462 33.9 (4.6) 773 34.8 (4.2)
 Maternal marital status 2447   766  
  Married, living together with husband N (%)   1919 (78.4)   616 (80.4)
  Unmarried, living together with partner (%)   468 (19.1)   136 (17.8)
  Unmarried, without partner N (%)   32 (1.3)   8 (1.0)
  Divorced N (%)   26 (1.1)   6 (0.8)
  Widowed N (%)   2 (0.1)   0
 Maternal education 2437   766  
  School leaving certificate after less than 10 years of schooling N (%)   254 (10.4)   54 (7.0)
  School leaving certificate after 10 years of schooling N (%)   778 (31.9)   272 (35.5)
  University entrance level N (%)   1369 (56.2)   498 (65.0)
  Other school leaving certificate N (%)   16 (0.7)   1 (0.1)
  No school leaving certificate N (%)   20 (0.8)   4 (0.5)
 Maternal employment before birth 2426   760  
  Full-time employed N (%)   1315 (54.2)   466 (61.3)
  Part-time employed N (%)   649 (26.8)   193 (25.4)
  Marginally/not regularly employed N (%)   82 (3.4)   18 (2.4)
  Maternal leave, housewife N (%)   243 (10.0)   56 (7.4)
  Pupil, student N (%)   37 (1.5)   16 (2.1)
  Seeking for employment N (%)   21 (0.9)   2 (0.3)
  Other N (%)   79 (3.3)   9 (1.2)
 Born in Germany N (%) 2449 2075 (84.7) 768 690 (89.8)
 Nationality 2448   768  
  German N (%)   2195 (89.7)   719 (93.6)
  Other N (%)   197 (8.1)   36 (4.7)
  German and other N (%)   65 (2.3)   13 (1.7)
Fathers
 Paternal education 1412a   643  
  School leaving certificate after less than 10 years of schooling N (%)   234 (16.6)   105 (16.4)
  School leaving certificate after 10 years of schooling N (%)   304 (21.5)   126 (19.4)
  University entrance level N (%)   843 (59.7)   401 (62.4)
  Other school leaving certificate N (%)   15 (1.1)   5 (0.8)
  No school leaving certificate N (%)   16 (1.1)   6 (0.9)
 Paternal employment 1486a   676  
  Full-time employed N (%)   1367 (92.0)   622 (92.0)
  Part-time employed N (%)   43 (2.9)   24 (3.6)
  Marginally/not regularly employed N (%)   8 (0.5)   3 (0.4)
  Paternal leave, househusband N (%)   24 (1.6)   10 (1.5)
  Pupil, student N (%)   22 (1.5)   8 (1.9)
  Seeking for employment N (%)   8 (0.5)   4 (0.6)
  Other N (%)   14 (0.9)   6 (0.9)
 Born in Germany N (%) 2427 2080 (85.7) 762 701 (92.0)
 Nationality 1457a   658  
  German N (%)   1360 (93.3)   619 (94.1)
  Other N (%)   74 (5.1)   27 (4.1)
  German and other N (%)   23 (1.6)   12 (1.8)
  1. Notes: M mean, SD standard deviation, N number of observations
  2. aLow total Ns as this information was assessed not at baseline, but at 4-week follow-up
  3. bOut of 1588 participants who already reached the 1-year follow-up time point