Comparison of two electronic hand hygiene monitoring systems in promoting hand hygiene of healthcare workers in the intensive care unit

Table 2 The variation of hand hygiene events per bed day in stages 1 and 2

HHEs	Coef.	Ne Wey-West Std. Err.	t	P > \|t\|	[95% CI]
_t	.015	.331	0.04	0.965	−.681	.710
_x2019m2	13.565	3.940	3.44	0.003	5.287	21.843
_x_t2019m2	1.829	.591	3.09	0.006	.587	3.071
_cons	76.565	2.368	32.33	0.000	71.589	81.540

Note. HHEs hand hygiene events, Coef coefficient, Std. Err. standard error, CI confidence interval, _t time since the start of the study, m month, _x(trperiod) dummy variable which representing the intervention periods (preintervention periods 0, otherwise 1), _x_t(trperiod) the interaction of _x and _t, _cons constant

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