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Table 1 Comparison of baseline variables for those retained and those lost-to-follow-up

From: The association between timing of initiation of antenatal care and stillbirths: a retrospective cohort study of pregnant women in Cape Town, South Africa

  Retained Lost-to-follow-up p-value
N (%) N (%)
Total 27,713 (79.9) 6,958 (20.1)  
Parity   
Primi/Multiparous 15,795 (57.0) 3,717 (53.4) <0.001
Nulliparous 11,918 (43.0) 3,241 (46.6)
Educational level    
None or primary 1,299 (4.7) 393 (5.7) <0.001
Secondary or tertiary 17,285 (62.4) 4,085 (58.7)
Missing 9,129 (32.9) 2,480 (35.6)
Race    
Other 532 (1.9) 140 (2.0) <0.001
Coloured 18,046 (65.1) 4,126 (59.3)
Black 9,135 (33.0) 2,692 (38.7)
Smoking    
No 13,580 (49.0) 3,323 (47.8) <0.001
Yes 6,704 (24.2) 1,441 (20.7)
Missing 7,429 (26.8) 2,194 (31.5)
First ANC visit facility    
Primary care facility 1 1,528 (5.5) 191 (2.8) <0.001
Primary care facility 2 6,673 (24.1) 3,536 (50.8)
Primary care facility 3 12,659 (45.7) 1,675 (24.1)
Primary care facility 4 6,853 (24.7) 1,556 (22.4)
First ANC visit year    
2006 2,788 (10.1) 1,699 (24.4) <0.001
2007 10,094 (36.4) 2,663 (38.3)
2008 11,946 (43.1) 1,913 (27.5)
2009 2,885 (10.4) 683 (9.8)
Gestational age at first ANC visit (3 Categories)    
1 st trimester 2,026 (7.3) 778 (11.2) <0.001
2 nd trimester 16,641 (60.1) 4,278 (61.5)
3 rd trimester 9,046 (32.6) 1,902 (27.3)
  Mean (SD) Mean (SD)  
Gestational age at first ANC visit (Continuous) 23.0 (7.2) 21.8 (7.3) <0.001
Maternal age 25.4 (6.0) 25.6 (6.2) 0.07
  1. SD, Standard Deviation.