Textile testing to assess the resistance to damage of long-lasting insecticidal nets for malaria control and prevention

Table 6 WHO hole size guidelines and hole index used to assess physical integrity of LLINs

WHO 2013 guidelines	Size banding	Hole diameter	Hole radius		Area of hole	Hole Index^a
WHO 2013 guidelines	cm	d; cm	r = d/2; cm	r²; cm²	cm²	Hole Index^a
Size 1 Smaller than a thumb	0.5–2	1.25	0.625	0.3906	1.23	1
Size 2 Larger than a thumb but smaller than a fist	2.5–10	6	3	9	28.28	23
Size 3 Larger than a fist but smaller than a head	11–25	17.5	8.75	76.5625	240.56	196
Size 4 Larger than a head	≥ 26	30^b	15	225	706.95	576

A -area of the hole pr²; p = 3.142; ^a Area divided by 1.23; ^b Assumed diameter

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