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Table 7 Estimates of ORSCL and ORMH (95% CI), and ORG (2.5–97.5pct): Australian data on SSRI-hip fracture (Study period = 180 days, Exposure Definition I)

From: A novel weighting method to remove bias from within-subject exposure dependency in case-crossover studies

Study period 180 days
Days in 1 period 1 day 5 days 20 days 30 days 60 days 90 days
M 179 35 8 5 2 1
ORSCL 2.02 (1.71–2.37) 1.85 (1.58–2.17) 1.76 (1.49–2.06) 1.72 (1.46–2.02) 1.59 (1.33–1.91) 1.51 (1.24–1.83)
ORMH 1.67 (1.46–1.92) 1.60 (1.39–1.84) 1.59 (1.37–1.84) 1.61 (1.38–1.88) 1.55 (1.30–1.85) 1.51 (1.24–1.83)
ORG 1.67 (1.49–1.90) 1.60 (1.40–1.83) 1.59 (1.39–1.83) 1.61 (1.41–1.87) 1.55 (1.30–1.81) 1.51 (1.24–1.85)
  1. M is the number of control periods
  2. ORSCL: odds ratio by the standard conditional logistic regression; ORMH: odds ratio by the Mantel-Haenszel method; ORG: odds ratio by the Greenland’s method; 95%CI: 95% confidence interval; 2.5–97.5pct: 2.5 to 97.5 percentiles