Improving Adult ART Clinic Patient Waiting Time by Implementing an Appointment System at Gondar University Teaching Hospital, Northwest Ethiopia

Table 2

Preintervention and postintervention waiting time and schedule error comparison.

Waiting service time (minutes)	Preintervention		Postintervention		Change	value
	Median	IQR (25th and 75th)	Median	IQR (25th and 75th)
Card retrieval	60	45 and 84.6	40	25 and 60	−33%	0.001
Pharmacy	55.2	30 and 60	38	30 and 50	−30%	0.942
Refilling	60	30 and 60	20	15 and 30	−67%	0.04
Laboratory	315	212 and 570	285	240 and 480	−10%	0.534
Health education	15	15 and 15	20	15 and 25	+32%	0.000
Overall waiting service time	274.8	180.6 and 453.6	165	120 and 377	−40%	0.02
Schedule error		%		%	Change	value
Correct appointment	1634	95.6%	1714	99.9%	—
Wrong appointment	76	4.4%	2	0.1%	−4.3%	<0.000

Significant at = 0.05.
IQR: interquartile range at the 25th and 75th percentile.