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Table 1. Statistical analysis of glucose oxidase (GOX) activity of caterpillars reared on plant vs artificial diet. Whole body GOX activities were compared by Student's t-test; labial salivary gland GOX activities were analyzed 1-way ANOVA followed by a Tukey post-hoc test. Significant differences are shown in Fig 1.
Instar Whole body GOX activity Labial salivary gland GOX activity
(U/caterpillar) (U/pair labial salivary gland) (U/mg per pair labial salivary gland)
Second not significant    
(df = 15, F = 7.298, p = 0.1876)    
Third significant difference significant difference not significant
(df = 12, F = 31.185, p <0.0001) (df = 20, p = 0.0025) (df = 20, p = 0.2097)
Fourth significant difference significant difference significant difference
(df = 18, F = 49.696, p = 0.0003) (df = 17, p < 0.0001) (df = 19, p = 0.0062)
Fifth significant difference not significant significant difference
(df = 18, F = 234.66, p = 0.0041) (df = 21, p = 0.2560) (df = 21, p = 0.0478)
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