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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