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Table 2 Pooled (age groups 20–25 and > 25) continuation rates (%) from the OS and RCT by age and parity

From: Cross design analysis of randomized and observational data – application to continuation rates for a contraceptive intra uterine device containing Levonorgestrel in adolescents and adults

Data source Age group and parity n Continuation rate year 1 (in %) Continuation rate year 1 (95%-Confidence Interval) Continuation rate year 2 (in %) Continuation rate year 2 (95%-Confidence Interval)
OS > 20 parous 2122 86 (84.65; 87.34) 74.79 (73.45; 76.13)
> 20 nulliparous 1245 87 (85.24; 88.75) 78.36 (76.60; 80.12)
< 20 parous 121 82 (74.50; 89.50) 73.00 (64.50; 81.50)
< 20 nulliparous 241 81 (76.00; 86.00) 67.00 (61.00; 73.00)
  3729
RCT > 20 parous 203 90.6 (86.58; 94.61) 81.49 (76.10; 86.88)
> 20 nulliparous 50 74.0 (61.84; 86.15) 70.00 (57.29; 82.70)
< 20 parous 0 NA NA NA NA
< 20 nulliparous 0 NA NA NA NA
  253