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Table 1 Results of binomial logistic regression analysis of factors affecting likelihood of SRE expression

From: Secondary reproduction in the herbaceous monocarp Lobelia inflata: time-constrained primary reproduction does not result in increased deferral of reproductive effort

Term Parameter estimate (±SE) Wald chi-square statistic df p Estimated odds ratio
Constant −2.34 (0.35) 45.25 1 0.23 -
Year = 2008 −0.30 (0.20) 2.27 1 0.74 1.07
Year = 2009 0.07 (0.17) 0.16 1 1.07 0.74
Year = 2010 0 - - - 1.00
Bolting month = June 2.93 (0.24) 149.82 1 < 0.001* 18.79
Bolting month = July 2.45 (0.23) 108.93 1 <0.001* 11.61
Bolting month = August 0.81 (0.24) 11.49 1 <0.001* 2.26
Bolting month = September 0 - - - 1.00
Size 0.02 (0.01) 3.33 1 0.07 1.02
  1. The four bolting groups were experimentally produced using a photoperiod manipulation, and this manipulation was repeated for three years from 2008-10. Prebolting plant size was measured as the length (in mm) of the longest living leaf of the unbolted rosette. The regression model significantly predicts likelihood of SRE expression (χ2 = 274.52, df = 6, p < 0.005). Odds ratios express relative likelihood of SRE expression.
  2. *p < 0.05.