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Table 1 Baseline characteristics of the study population

From: Adverse events, bone mineral density and discontinuation associated with generic alendronate among postmenopausal women previously tolerant of brand alendronate: a retrospective cohort study

Characteristic First Period (July 2003 to September 2005) Second Period (October 2005 to December 2007) Difference (p value of the test of difference)
Mean age (years) 65.6 (9.5) 67.6 (9.5) 2 (<0.0001)
NSAID use (%) 31% 25% 6% (0.08)
Vitamin D use (%) 81% 86% 5% (0.1)
Calcium use (%) 80% 75% 5% (0.17)
Estrogen use (%) 6% 9% 3% (0.16)
  1. SD: standard deviation; NSAID: non-steroidal anti-inflammatory drug