Using the critical path method to rollout and optimise new PMTCT guidelines to eliminate mother-to-child transmission of HIV in Zimbabwe: a descriptive analysis

Table 4 Regression discontinuity results for critical path indicators; 2010–2015

Indicator	P-value for Sktest of normality	Slope of linear curve before introducing intervention (β1)	Slope of linear curve after introducing intervention (β2)	Decision
Indicator	P-value*	Slope (95% CI)	Slope (95% CI)	Decision
ANC Bookings	0.3434	0.001 (−0.005–0.006)	0.310 (0.220–0.401)	β₂ > β₁ > 0
HIV Testing	0.1542	−0.001 (− 0.004–0.002)	0.029 (− 0.023–0.812)	^a
AZT Prophylaxis	0.8391	0.142 (− 0.002–0.030)	0.271 (0.108–0.443)	β₂ > β₁ > 0
CD4 Testing	0.0560	0.008 (0.001–0.015)	0.168 (0.040–0.296)	β₂ > β₁ > 0
Mothers’ ART	0.0024	0.005 (−0.003–0.014)	0.160 (0.036–0.282)	β₂ > β₁ > 0
Infant ARVs	0.3617	0.007 (0.002–0.012)	−0.064 (− 0.144–0.017)	^a
EID	0.1502	0.010 (− 0.002–0.022)	0.309 (0.107–0.511)	β₂ > β₁ > 0

* Indicator meets normal distribution criteria if P > 0.05 or sample is large (> 3000 in all indicators, Table 3)
^a 95% CI of β₁ and β₂ overlapping or β₂ < β₁ hence no difference in slope between the two segments of the indicator’s curve, before and after the start of interventions

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