Instrument completion rate by time estimate: NIS-Teen questionnaire redesign study (time estimate in minutes)^a								Significance^f
	Control (20 or 15 minutes)	Long (15 minutes)	Medium (15 minutes)	Short (10 minutes)	^b	^c	^d	^e
Resolution rate	38.24%	39.31%	38.64%	38.97%	n.s.	n.s.	n.s.	n.s.
Screener completion rate	73.01%	73.26%	74.29%	73.33%	n.s.	n.s.	n.s.	n.s.
Interview completion rate	71.83%	73.03%	78.63%	82.05%	0.001	n.s.	0.001	0.001
CASRO response rate	20.05%	21.03%	22.57%	23.45%	0.001	n.s.	0.01	0.001
Percent reduction in HPC	–	4.9%	12.8%	23.8%