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Table 2 LLIN characteristics for case and control children

From: The effect of holes in long-lasting insecticidal nets on malaria in Malawi: results from a case–control study

Bed Net Parameters Total, n = 248 Control children, n = 151 Case children, n = 97 p value
N (%) or Median (IQR) N (%) or Median (IQR) N (%) or Median (IQR)
Nets with at least one hole > 0.5 cm diameter 214 (86.3) 127 (84.1) 87 (89.7) 0.26
Nets with at least one hole of any size 223 (89.9) 133 (88.1) 90 (92.8) 0.28
Nets with at least one hole ≥ 10 cm diameter 43 (17.3) 30 (19.9) 13 (13.4) 0.23
Total number of holes of any size 9 (3, 22) 9 (2, 23) 9 (4, 20) 0.82
Total number of holes > 0.5 cm diameter 7 (2, 18) 7 (2, 19) 6 (3, 14) 0.91
Number holes in net roof 0 (0, 2) 0 (0, 2) 0 (0, 2) 0.41
Number of holes in upper half of net 2 (0, 6) 2 (0, 6) 2 (0, 5) 0.68
Number of holes lower half of net 7 (2, 16) 7 (1, 18) 6 (2, 13) 0.63
Repaired holes     
 None 201 (81.1) 124 (82.1) 77 (79.4)  
 ≥ 1 47 (19.0) 27 (17.9) 20 (20.6) 0.62
Total hole area (cm2) 9.4 (1.8, 69.8) 9.9 (1.7, 124.6) 8.3 (2.2, 47.3) 0.52
pHI
 Good (< 79 cm2) 192 (77.4) 109 (72.2) 83 (85.6)  
 Damaged (80–789 cm2) 40 (16.1) 30 (19.9) 10 (10.3)  
 Too torn (> 790 cm2) 16 (6.5) 12 (8.0) 4 (4.1) 0.048*
Total hole area quartiles
 Q1: (≤ 1.8 cm2) 62 (25.0) 40 (26.5) 22 (22.7)  
 Q2: (> 1.8–≤ 9.5 cm2) 62 (25.0) 34 (22.5) 28 (28.9)  
 Q3: (9.5–≤ 70.0 cm2) 62 (25.0) 33 (21.9) 29 (29.9)  
 Q4: (> 70.0–≤ 2561.6 cm2) 62 (25.0) 44 (29.1) 18 (18.6) 0.14
  1. * p value < 0.05