Association between malaria control and paediatric blood transfusions in rural Zambia: an interrupted time-series analysis

Table 3 Association between paediatric malaria outpatient visits, malaria admissions, malaria admissions for severe malarial anaemia and paediatric blood transfusions

	Dependent variable: paediatric blood transfusions
	(1)	(2)	(3)	(4)	(5)	(6)
Paediatric malaria outpatient visits	0.07**	0.03**
	(0.03)	(0.02)
Paediatric malaria outpatient visits X period 2004-2008		0.02
		(0.03)
Paediatric malaria admissions			0.19**	0.21***
			(0.08)	(0.02)
Paediatric malaria admissions X period 2004-2008				−0.08
				(0.06)
Paediatric severe malarial anaemia admissions					1.09***	1.05***
					(0.07)	(0.06)
Paediatric severe malarial anaemia admissions X period 2004-2008						−0.60***
						(0.22)
Period 2004–2008 (dummy variable)		−16.59**		2.47		−0.46
		(6.78)		(4.04)		(3.01)
Constant	11.17	27.51***	3.25	1.46	2.66*	4.66
	(8.01)	(8.65)	(4.56)	(4.32)	(1.39)	(3.48)
Observations	102	102	72	72	72	72
Mean of dependent variable	23.77	23.77	14.24	14.24	14.24	14.24
Wald Chi-Squared	219.92	223.69	318.27	601.49	1.40e + 12	3483.32

*Significant at 10%; **significant at 5%; ***significant at 1%. Coefficient standard errors are noted in parentheses.
This table presents six different regressions where, in each regression, the dependent variable is the number of paediatric blood transfusions. Regressions use an autoregressive-moving-average model with 2 lags and robust standard errors. We control for the month of the year in all regressions to account for seasonal correlations. Period 2004–2008 variable is a dummy variable that takes on a value of 1 for the years 2004–2008, and 0 otherwise. The interaction term, Paediatric malaria outpatient visits X period 2004–2008, is included to identify whether the association between paediatric malaria outpatient visits and paediatric blood transfusions is different during the 2004–2008 period compared to the 2000–2003 period. The same definitions apply for the other interaction terms.