Table 2.

Cox regression results (hazard ratio and Wald statistics) of potentially influential factors for lifespan, AFF^* and flightspan^*

Dependent variable	Independent factor	Experiment 1	Experiment 2	Experiment 3	Experiment 4
Lifespan	Single cohort	HR = 0.48 (0.41 – 0.57) z2 = 77.8 p < 0.001	HR = 1.46 (1.04 – 2.06) z2 = 4.8 p = 0.028	HR = 071 (0.47 – 1.06) z2 = 2.8 p = 0.094	HR = 1.31 (1.17 – 1.46) z2 = 22.6 p < 0.001
	Dual cohort	HR = 0.68 (0.57 – 0.82) z2 = 17.1 p < 0.001	HR = 4.96 (3.01 – 8.19) z2 = 39.4 p < 0.001	HR = 0.69 (0.49 – 0.96) z2 = 4.7 p = 0.030	HR = 1.05 (0.94 – 1.17) z2 = 0.7 p = 0.414
	AFF	HR = 0.94 (0.9 4 – 0.95) z2 = 174.4 p < 0.001	HR = 0.94 (0.93 – 0.95) z2 = 66.1 p < 0.001	HR = 0.93 (0.92 – 0.95) z2 = 62.0 p < 0.001	N/A
	Pollen proportion	HR = 1.38 (1.06 – 1.81) z2 = 5.6 p = 0.018	HR = 0.84 (0.54 – 1.31) z2 = 0.6 p = 0.438	HR = 1.32 (0.79 – 2.22) z2 = 1.1 p = 0.293	N/A
AFF	Single cohort	HR = 0.49 (0.42 – 0.57) z2 = 90.2 p < 0.001	HR = 1.03 (0.75 – 1.42) z2 = 0.04 p = 0.852	HR = 0.86 (0.58 – 1.30) z2 = 0.5 p = 0.478	N/A
	Dual cohort	HR = 0.54 (0.46 – 0.64) z2 = 49.6 p < 0.001	HR = 4.00 (2.47 – 6.46) z2 = 32.0 p < 0.001	HR = 1.28 (0.92 – 1.78) z2 = 2.1 p = 0.143	N/A
	Pollen proportion	HR = 1.20 (0.96 – 1.51) z2 = 2.4 p = 0.118	HR = 1.30 (0.89 – 1.91) z2 = 1.8 p = 0.176	HR = 0.84 (0.54 – 1.32) z2 = 0.6 p = 0.449	N/A
Flightspan	Single cohort	HR = 0.48 (0.41 – 0.57) z2 = 75.8 p < 0.001	HR = 1.40 (0.99 – 1.96) z2 = 3.7 p = 0.055	HR = 0.77 (0.51 – 1.15) z2 = 1.6 p = 0.203	N/A
	Dual cohort	HR = 0.68 (0.57 – 0.82) z2 = 17.3 p < 0.001	HR = 2.98 (1.82 – 4.86) z2 = 19.0 p < 0.001	HR = 0.75 (0.53 – 1.05) z2 = 2.8 p = 0.096	N/A
	AFF	HR = 1.03 (1.03 – 1.04) z2 = 56.8 p < 0.001	HR = 1.03 (1.01 – 1.04) z2 = 10.2 p = 0.001	HR = 1.03 (1.01 – 1.05) z2 = 10.7 p = 0.001	N/A
	Pollen proportion	HR = 1.41 (1.08 – 1.85) z2 = 6.2 p = 0.013	HR = 0.77 (0.49 – 1.22) ) z2 = 1.2 p = 0.270	HR = 1.39 (0.82 – 2.36) z2 = 1.5 p = 0.220	N/A

^*limited sampling in experiment 4 precluded meaningful calculations