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Table 1 ETV minimum (mean ± SEM) and fraction of hamsters exhibiting threshold gonadal regression in 13L:11D.

From: Independence of circadian entrainment state and responses to melatonin in male Siberian hamsters

  Week 2–4 Week 4–8 ETV minimum Fraction regressed
Mel capsule LD LD 335 ± 71 4 / 8
  LD SD 370 ± 48 5 / 1 0
  SD LD 456 ± 27 0 / 7
  SD SD 455 ± 24 0 / 7
    *p = 0.05 **p < 0.01
Beeswax capsule LD LD 386 ± 57 2 / 5
  SD LD 229 ± 59 3 / 5
  1. *significant main effect of Week 2–4 photoperiod in two-factor ANOVA **significant effect of Week 2–4 photoperiod by Fisher's exact test