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. Author manuscript; available in PMC: 2015 Jan 28.
Published in final edited form as: Mar Environ Res. 2014 Apr 26;99:117–124. doi: 10.1016/j.marenvres.2014.04.007

Table 4.

Hazard ratio (HR) and 95% confidence intervals (95% CI) for each treatment in the unstratified and stratified by pre and post hatching models. P-value for the difference between pre and post hatch hazard ratios.

Unstratified Model Pre-Hatch Post-Hatch Difference
HR (95% CI) HR (95% CI) HR (95% CI) p-value
0.125X 1.54 (0.77, 3.12) 2.84 (1.02, 7.89)* 0.74 (0.26, 2.12) 0.072
0.25X 1.07 (0.51, 2.29) 1.81 (0.61, 5.39) 0.62 (0.20, 1.89) 0.178
0.5X 2.03 (1.04, 3.95)* 3.48 (1.28, 9.44)* 1.12 (0.43, 2.91) 0.107
1X 1.54 (0.77, 3.11) 3.26 (1.19, 8.90)* 0.48 (0.15, 1.62) 0.017
*

p-value<0.05