Table 2 Interrupted time series segmented regression analysis showing the impact of major anti-malarial interventions from 1990 to 2022
Year of change point | Interventions* | Factors | Beta coefficient | Standard error | t | P value |
|---|---|---|---|---|---|---|
1997 | EMCP | Intercept | − 366,103,779 | 63,332,205 | − 5.781 | < 0.0001 |
Year | 184,914 | 31,777 | 5.819 | < 0.0001 | ||
Immediate effect | − 406,760 | 133,185 | − 3.054 | 0.005 | ||
Sustained effect | − 274,754 | 32,080 | − 8.565 | < 0.0001 | ||
2006 | IMCP + RDT(PF) + ACT (ASP) | Intercept | 67,536,474 | 30,212,557 | 2.235 | 0.033 |
Year | − 32,693 | 15,125 | − 2.161 | 0.039 | ||
Immediate effect | − 70,923 | 194,286 | − 0.365 | 0.718 | ||
Sustained effect | − 70,867 | 20,480 | − 3.460 | 0.002 | ||
2013 | ASHA + RDT(PF + PV) + ACT(ASP/AL) | Intercept | 112,158,649 | 18,390,013 | 6.099 | < 0.0001 |
Year | − 55,050 | 9190 | − 5.990 | < 0.0001 | ||
Immediate effect | − 77,516 | 232,003 | − 0.334 | 0.741 | ||
Sustained effect | − 69,221 | 33,475 | − 2.068 | 0.048 | ||
2016 | NFME + RDT(PF + PV) + ACT(ASP/AL) + LLIN (scale-up) | Intercept | 122,813,847 | 15,355,727 | 7.998 | < 0.0001 |
Year | − 60,384 | 7668 | − 7.875 | < 0.0001 | ||
Immediate effect | − 58,668 | 271,886 | − 0.216 | 0.831 | ||
Sustained effect | − 94,662 | 55,948 | − 1.692 | 0.101 |