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Fig. 4 | BMC Medical Research Methodology

Fig. 4

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

Fig. 4

Estimates of OR_SCL, OR_VF, OR_MH and OR_G for simulated data with a fixed study period. OR_SCL, OR_VF and OR_MH with their 95% CI, and OR_G with its 2.5–97.5pct for the exposure (exp(β)) where study period is fixed as 22 days but the number of days in 1 period is varied. When 1 period = 1 or 7 days, OR_VF is not obtainable because the positivity condition is not satisfied. (a) one binary exposure variable only. (b) one binary exposure variable and one binary time-varying confounder. OR_SCL: odds ratio by the standard conditional logistic regression (ORSCL); OR_VF: odds ratio by the Vines and Farrington’s method (ORVF); OR_MH: odds ratio by the Mantel-Haenszel method (ORMH); OR_G: odds ratio by the Greenland’s method (ORG)

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BMC Medical Research Methodology

ISSN: 1471-2288

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