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Table 4

Comparison of ventilation rates in modified VIP designs with the recommended rate

Design set-upVentilation rate (m3/h)
Mean-Raz-scorebSignificance
MeanSD
STD100 33.49 6.33 13.49 −3.180 0.000** 
MTD100 26.23 3.76 6.23 −3.041 0.000** 
SSW100 33.93 8.07 13.93 −3.180 0.000** 
MSW100 17.63 1.80 −2.37 −3.042c 0.000** 
STD150 74.10 20.03 54.10 −3.181 0.000** 
MTD150 47.84 8.37 27.84 −3.180 0.000** 
SSW150 60.41 15.94 40.41 −3.181 0.000** 
MSW150 45.05 8.21 25.05 −3.182 0.000** 
Design set-upVentilation rate (m3/h)
Mean-Raz-scorebSignificance
MeanSD
STD100 33.49 6.33 13.49 −3.180 0.000** 
MTD100 26.23 3.76 6.23 −3.041 0.000** 
SSW100 33.93 8.07 13.93 −3.180 0.000** 
MSW100 17.63 1.80 −2.37 −3.042c 0.000** 
STD150 74.10 20.03 54.10 −3.181 0.000** 
MTD150 47.84 8.37 27.84 −3.180 0.000** 
SSW150 60.41 15.94 40.41 −3.181 0.000** 
MSW150 45.05 8.21 25.05 −3.182 0.000** 

aRecommended ventilation rate of 20 m3/h.

bBased on the Wilcoxon signed-rank test, T; Mean-R.

cBased on positive ranks; all other z-scores based on negative ranks.

**Significant at 1% level, one-tailed (Source: own field data).

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