Table 2 A summary of Chi-square comparisons of study characteristics and density change categories
Study characteristics | Number of observations within category studies (%) | Chi-square tests of independence | ||
|---|---|---|---|---|
Category D | Category I | Category ID | ||
Intervention type | ||||
 ITNs or LLINs | 10 (30.4) | 1 (100) | 12 (75) | Χ2 = 11.564, df = 4, P = 0.021b |
 IRS | 16 (48.4) | – | 1 (6.25) | |
 Othera | 7 (21.2) | – | 3 (18.75) | |
Insecticide type | ||||
 Pyrethroids | 16 (48.5) | 1 (100) | 15 (93.7) | Χ2 = 10.157, df = 2, P = 0.006b* |
 Non-pyrethroids | 17 (51.5) | – | 1 (6.3) | |
Insecticide resistance | ||||
 Resistance | 18 (55) | 1 (100) | 7 (43.8) | Χ2 = 1.445, df = 2, P = 0.486b |
 No resistance | 15 (45) | – | 9 (56.2) | |
Malaria transmission | ||||
 Increased transmission | 2 (16) | – | 1 (9) | Χ2 = 0.290, df = 1, P = 0.590c |
 Decreased transmission | 10 (84) | – | 10 (91) | |
Collection methods | ||||
 Indoor | 24 (72) | – | 10 (55.7) | Χ2 = 5.705, df = 4, P = 0.222b |
 Outdoor | 3 (10) | – | 3 (16.6) | |
 Indoor + Outdoor | 6 (18) | 1 (100) | 5 (27.7) | |