Table 3.

Evaluation of the differences in (i) activity loss and (ii) mortality among cercariae of different trematode taxa at 6°C

Trematode taxa (N, number cercariae)	(i) Activity loss						(ii) Mortality
Reference vs compared	Time section	exp(β)a	se(β)b	z-valuec	P value	Interpretation of activity loss	Time section	exp(β)	se(β)	z-value	P value	Interpretation of mortality
Diplostomum spp. – Apatemon spp. N = 415 – N = 215	0–13 h	0.281	0.209	−6.078	<0.001	3.56 times ▾	0–26 h	0.098	0.242	−9.594	<0.001	10.23 times ▾
	13–22 h	10.729	0.273	8.708	<0.001	10.73 times ▴	26–44 h	5.927	0.299	5.955	<0.001	5.92 times ▴
	22–76 h	57.114	0.307	13.196	<0.001	57.11 times ▴	44–76 h	21.123	0.316	9.643	<0.001	21.12 times ▴
Diplostomum spp. – small-sized Plagiorchis spp. N = 415 – N = 426	0–13 h	0.060	0.227	−12.395	<0.001	16.69 times ▾	0–26 h	0.069	0.187	−14.307	<0.001	14.56 times ▾
	13–22 h	29.135	0.269	12.560	<0.001	29.13 times ▴	26–44 h	26.774	0.239	13.739	<0.001	26.77 times ▴
	22–76 h	46.31	0.276	13.875	<0.001	46.31 times ▴	44–76 h	52.312	0.326	12.138	<0.001	52.31 times ▴
Diplostomum spp. – large-sized Plagiorchis spp. N = 415 – N = 62	0–13 h	0.023	1.016	−3.711	<0.001	43.37 times ▾	0–26 h	0.026	0.723	−5.024	<0.001	37.76 times ▾
	13–22 h	2.353	1.250	0.684	0.494		26–44 h	67.352	0.776	5.427	<0.001	67.35 times ▴
	22–76 h	40.694	1.045	3.547	<0.001	40.69 times ▴	44–78 h	211.540	0.800	6.691	<0.001	211.54 times ▴
Apatemon spp. – small-sized Plagiorchis spp. N = 215 – N = 426	0–13 h	0.213	0.296	−5.225	<0.001	4.69 times ▾	0–26 h	0.703	0.293	−1.204	0.229
	13–22 h	2.716	0.333	3.001	0.003	2.72 times ▴	26–44 h	4.5174	0.328	4.600	<0.001	4.52 times ▴
	22–48 h	0.811	0.353	−0.594	0.552		44–72 h	2.4766	0.405	2.240	0.025	2.48 times ▴
Apatemon spp. – large-sized Plagiorchis spp. N = 215 – N = 62	0–13 h	0.082	1.037	−2.412	0.016	12.20 times ▾	0–26 h	0.271	0.762	−1.714	0.087
	13–22 h	0.219	1.272	−1.193	0.233		26–44 h	11.364	0.815	2.983	0.003	11.36 times ▴
	22–64 h	0.713	1.079	−0.314	0.753		44–78 h	10.015	0.843	2.733	0.006	10.01 times ▴
Small-sized Plagiorchis spp. – large-sized Plagiorchis spp. N = 426 – N = 62	0–13 h	0.385	1.037	−0.921	0.357		0–26 h	0.386	0.741	−1.285	0.199
	13–22 h	0.081	1.264	−1.991	0.047	12.38 times ▾	26–44 h	2.516	0.783	1.177	0.239
	22–64 h	0.879	1.064	−0.121	0.903		44–78 h	4.048	0.788	1.774	0.076

Results evaluating (i) Cox proportional hazards regression (CoxPH) [time active cercariae at 6°C – trematode taxa + plate (random) + trial (random)], and (ii) Cox proportional hazards regression (CoxPH) [time live cercariae at 6°C – trematode taxa + plate (random) + trial (random)]. If step function is required to accomplish the model assumptions, time sections are indicated in the table. The interpretation of results, comparing the different taxa of cercariae at 6°C, use arrows to indicate a higher (▴) or lower (▾) activity loss or mortality of the compared trematode taxa (right place in first column). Statistically significant results (at α = 0.05) are indicated in bold.

^aHazard ratio (exponentiated coefficients). The hazard rate (exp^(β)) of cercariae of each taxon (located in left side of first column) in both models (i, ii) is 1, to which the other taxa are compared. If exp^(β) < 1, activity loss or mortality is reduced for the compared trematode taxa (right place in first column).

^bStandard error of coefficients.

^cTest criterion value.