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

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

		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%	161^d (270)	11.2	0.110	10.9	0.256	10.7	0.383	12.6	0.361
≥50%	505^d (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

^aAdjusted for baseline: age, primigravidity, NTx, and dietary calcium and total energy intakes.
^bCompliance assessed by pill count at each visit and analyzed as proportion of expected pills used between consecutive visits.
^cPercent reduction: 1-e^β.
^dNumbers of subjects do not add to 563 because subjects may appear in more than one stratum due to time-varying nature of compliance.

ISSN: 1475-2891