Effects of Snail Density on Growth, Reproduction and Survival of Biomphalaria alexandrina Exposed to Schistosoma mansoni

Table 1

Minimal adequate model for weight of snails containing all significant terms. Insignificant first-order terms were retained only if a second-order interaction containing that term was significant.

Fixed terms	Coefficient	t-value	$P$ -value
Intercept	0.6	8.68	<.0001
Day	0.6	8.68	<.0001
Density	−0.0083	16.37	.0088
Exposure to parasite	−0.12	−3.33	.074
Day: density	−0.0003	−2.02	<.0001
Day: exposure	−0.0027	−3.00	.0033

Log likelihood = 88.34, DF = 117.