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

Table 5 Association between malaria control scale-up over time and paediatric blood transfusions - interrupted time series

	Dependent variable: paediatric blood transfusions
	(1)	(2)
Monthly trend 2000-2003	−0.60***	−0.52***
	(0.12)	(0.10)
Difference in monthly use 2004–2008 (relative to 2000–2003)	−10.58***
	(3.35)
Monthly trend 2004-2008	−0.02
	(0.04)
Difference in monthly use 2004–2006 (relative to 2000–2003)		−19.06***
		(3.56)
Monthly trend 2004-2006		0.34***
		(0.10)
Difference in monthly use 2007–2008 (relative to 2000–2003)		−27.47***
		(6.56)
Monthly trend 2007-2008		−0.14
		(0.22)
February	5.79	4.88
	(4.53)	(4.70)
March	15.00	13.96
	(9.64)	(9.86)
April	26.99*	26.43*
	(14.34)	(13.81)
May	18.69	18.87
	(13.41)	(12.64)
June	−9.22	−8.40
	(11.51)	(11.79)
July	−16.37	−15.30
	(10.70)	(11.78)
August	−20.81**	−20.01*
	(10.22)	(11.76)
September	−23.94**	−23.87**
	(9.84)	(11.26)
October	−24.08***	−24.90**
	(8.96)	(9.95)
November	−24.54***	−26.06***
	(7.47)	(8.03)
December	−9.89**	−11.60**
	(4.70)	(5.56)
Constant	56.59***	55.12***
	(7.62)	(7.45)
Observations	108	108
Mean of dependent variable	22.79	22.79
Wald Chi-Squared	2734.85	3740.52

*Significant at 10%; **significant at 5%; ***significant at 1%. Coefficient standard errors are noted in parentheses.
Regressions use an autoregressive-moving-average model with 2 lags and robust standard errors. The variables are identified as in Table 3. The month variables represent a dummy variable for each month. The base (omitted) variable is January.