Table 6: Time effect analysis: pairwise Poisson test for early (1–8) and late (9–16) trials.

ComparisonTemperature Early trials (1-8)Late trials (9-16)
Test statisticP-valueTest statisticP-value

C versus H2O 45× 20°240.831.2030 n.s.1.600.0548 n.s.
C versus H2O 45× 40°24 0.251.4009 n.s.0.600.2743 n.s.
C versus H2O 45× 70°240.314.3768 n.s. 0.369.3561 n.s.
C versus H2O 45× 100°241.224.1105 n.s. 0.295.3840 n.s.

C versus As 45× 20°240.570.2843 n.s.3.156.0008***
C versus As 45× 40°240.514.3036 n.s.3.170.0008***
C versus As 45× 70°241.638.0507 n.s.2.571.0051**
C versus As 45× 100°240.958.1690 n.s.0.855.1963 n.s.

H2O 45× versus As 45× 20°24 0.260.3974 n.s.1.569.0583 n.s.
H2O 45× versus As 45× 40°240.765.2221 n.s.2.577.0050**
H2O 445× versus As 45× 70°240.611.2706 n.s.1.784.0372*
H2O 445× versus As 45× 100°24 0.266.3951 n.s.1.150.1251 n.s.

C = control; N = sample size; n.s. = not significant.
* P  .05; **P  .01; ***P  .001.