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Table 1 Maternal characteristics of women in the registry by follow-up status, 2010-2013

From: Lost to follow-up among pregnant women in a multi-site community based maternal and newborn health registry: a prospective study

Variable Lost to Follow-up N (%) Completed Follow-up N (%) RR (95% CI)
Follow-up status, N 4,893 277,733  
Status at enrollment    
Pregnant 4,145 (96.1) 243,397 (87.7) 2.2 (1.7, 2.8)
Delivered 170 (3.9) 34,206 (12.3) 1.0
Last menstrual period known    
Yes 3,724 (76.1) 256,241 (92.3) 1.0
No 1,169 (23.9) 21,492 (7.7) 2.2 (1.1, 4.4)
Maternal age    
< 20 559 (13.0) 33,024 (11.9) 1.2 (1.1, 1.3)
20-35 3,532 (82.0) 233,647 (84.3) 1.0
> 35 214 (5.0) 10,626 (3.8) 0.8 (0.7, 1.1)
Education    
No formal education 2,090 (48.5) 69,370 (25.1) 1.2 (1.1, 1.4)
Primary 1,283 (29.8) 103,797 (37.5) 1.1 (1.0, 1.2)
Secondary 772 (17.9) 83,361 (30.1) 1.1 (1.0, 1.2)
University 162 (3.8) 19,963 (7.2) 1.0
Parity    
0 1,245 (28.9) 93,460 (33.7) 1.0 (1.0, 1.1)
1-2 1,631 (37.8) 117,243 (42.3) 1.0
> 2 1,435 (33.3) 66,217 (23.9) 0.8 (0.7, 0.9)
Last pregnancy resulted in a live birth    
Yes 2,797 (91.3) 172,183 (93.9) 1.0
No 268 (8.7) 11,164 (6.1) 1.1 (0.9, 1.3)