Table 2 Household type-, IRS-status- and insecticide susceptibility-based risk combinations (at high, medium and low levels) developed for risk-index calculation
Level of risk | Score range | Risk combinations |
|---|---|---|
HT-based risk index | ||
 Low | 1–2 | (A1 + B1 + C1 + D1); (A2 + B1 + C1 + D1); (A2 + B2 + C1 + D1); (A1 + B2 + C2 + D1); (A1 + B1 + C2 + D2); (A2 + B1 + C2 + D1); (A2 + B1 + C1 + D2); (A1 + B2 + C1 + D2); (A1 + B1 + C1 + D3) |
 Medium | 3–4 | (A2 + B2 + C2 + D2); (A2 + B2 + C2 + D1); (A2 + B2 + C1 + D2); (A2 + B1 + C2 + D2); (A1 + B2 + C2 + D2); (A2 + B1 + C1 + D3); (A1 + B2 + C1 + D3); (A1 + B1 + C2 + D3); (A2 + B3 + C2 + D1) |
 High | 5–8 | (A2 + B2 + C2 + D3); (A2 + B3 + C3 + D1); (A2 + B3 + C3 + D2); (A2 + B3 + C3 + D3); (A2 + B3 + C2 + D3); (A2 + B4 + C2 + D1); (A2 + B4 + C2 + D2); (A2 + B4 + C2 + D3); (A2 + B4 + C3 + D1); (A2 + B4 + C3 + D2); (A2 + B4 + C3 + D3) |
IRS status (IRSS)-based risk index | ||
 No risk | 0 | E3 |
 Medium | 1 | E2 |
 High | 2 | E1 |
Vector susceptibility to insecticides (VSI)-based risk index | ||
 Mortality> 98% | 0 | F3 |
 Mortality 90–98% | 1 | F2 |
 Mortality < 90% | 2 | F1 |