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. Author manuscript; available in PMC: 2019 Apr 21.
Published in final edited form as: Ann Intern Med. 2018 Jun 26;169(3):146–155. doi: 10.7326/M17-2252

Appendix Table 9.

Pooled (crude) and common IRR after stratification by the year of enrollment

Pooled IRR Common IRR* Mantel Haenzsel test of
homogeneity p-value
Depression
 All participants 0.48 (0.34, 0.67) 0.54 (0.34, 0.84) 0.24
 Excluding baseline
depressed
0.37 (0.20, 0.67) 0.36 (0.20, 0.67) 0.37
Suicidal ideation
 All participants 0.42 (0.22, 0.76) 0.40 (0.16, 1.03) 0.122
 Excluding baseline
suicidal
0.41 (0.19, 0.82) 0.35 (0.11, 1.09) 0.27

IRR = incidence rate ratio

*

The common IRR was produced by combining Mantel Haenzsel-weighted stratum-specific IRRs (the strata combined were the three strata for year of enrollment)