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Table 3 Effect of calcium supplementation a on NTx by treatment compliance b

From: Effect of calcium supplementation on bone resorption in pregnancy and the early postpartum: a randomized controlled trial in Mexican Women

   Average (Overall) 2nd trimester 3rd trimester 1-month postpartum
Compliance N (Obs) %∆c p-value %∆c p-value %∆c p-value %∆c p-value
ALL 563 (1510) 15.8 <0.001 13.7 0.002 15.6 0.001 18.6 <0.001
<50% 161d (270) 11.2 0.110 10.9 0.256 10.7 0.383 12.6 0.361
≥50% 505d (1240) 17.3 <0.001 14.9 0.003 15.6 0.002 19.2 <0.001
≥67% 378 (790) 21.3 <0.001 19.0 0.005 19.2 0.001 23.0 <0.001
≥75% 267 (423) 22.1 <0.001 25.0 0.171 19.0 0.006 21.9 0.002
  1. aAdjusted for baseline: age, primigravidity, NTx, and dietary calcium and total energy intakes.
  2. bCompliance assessed by pill count at each visit and analyzed as proportion of expected pills used between consecutive visits.
  3. cPercent reduction: 1-eβ.
  4. dNumbers of subjects do not add to 563 because subjects may appear in more than one stratum due to time-varying nature of compliance.