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. Author manuscript; available in PMC: 2012 Nov 1.
Published in final edited form as: Ann Entomol Soc Am. 2011 Nov;104(6):1309–1318. doi: 10.1603/AN11032

Table 1.

Results for survival analysis using multivariate Cox proportional hazard model

Parameter χ2 df P Hazard
ratio
Population 6.22 5,95 0.2856
Cumulative no. developed eggsb 4.14 1,95 0.0419 0.978
Cumulative no. diapause eggs 0.04 1,95 0.8489 0.998
Cumulative no. infertile eggs 0.45 1,95 0.5020 1.009
Date 6.75 1,95 0.0094 1.009
Incubator 1.71 1,95 0.1905 0.441
Wing length 0.44 1,42 0.5503 0.546

Significant effects are indicated in bold and are reported in the main text. Pairwise contrasts between populations are not shown for brevity. For parameters corresponding to continuous variables, the hazard ratios are the ratio of hazard rates for an increase of 1 U of the variable.