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Table 2 Effect of gastro-intestinal nematode infection on production in sheep reported in 218 trials

From: Effect of gastro-intestinal nematode infection on sheep performance: a systematic review and meta-analysis

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