Table 2.

Effect of gastro-intestinal nematode infection on production in sheep reported in 218 trials

Reported effect of parasitism on production	Measured production trait	Total number of trials	Number of trials reporting a p-value	Number of statistically significant trials (p < 0.05)	% of statistically significant trials
Negative	Weight gain	147	122	74	60.66
	Wool growth	24	21	11	52.38
	Milk yield	16	16	9	56.25
	Total	187	159	94	59.12
Positive	Weight gain	18	15	2	13.33
	Wool growth	4	1	0	0.00
	Milk yield	2	2	0	0.00
	Total	24	18	2	11.11
None	Weight gain	6	6	0	0.00
	Wool growth	1	0	0	0.00
	Milk yield	0	0	0	0.00
	Total	7	6	0	0.00