Table 1.

Dropout rate and descriptive statistics of completes and dropouts, by study arm

Study arm	Overlap	Presentation	Dropout rate	Variable	Completes					Dropouts[Link]
					N	M	SD	Min	Max	N	M	SD	Min	Max
1				Age	541	48	17	18	92	86	55	16	18	82
	No	No color	13.7% (base)	Male (dummy)		0.52		0	1		0.55		0	1
				Educ_low		0.32		0	1		0.55		0	1
				Educ_med		0.41		0	1		0.34		0	1
				Educ_high		0.27		0	1		0.12		0	1
2				Age	540	47	17	18	87	59	54	14	24	81
	No	Shades of purple	9.8%**	Male (dummy)		0.47		0	1		0.54		0	1
				Educ_low		0.32		0	1		0.37		0	1
				Educ_med		0.42		0	1		0.42		0	1
				Educ_high		0.25		0	1		0.20		0	1
3				Age	553	47	17	18	84	59	55	18	19	89
	Yes	No color	9.6%**	Male (dummy)		0.47		0	1		0.41		0	1
				Educ_low		0.34		0	1		0.49		0	1
				Educ_med		0.40		0	1		0.34		0	1
				Educ_high		0.25		0	1		0.17		0	1
4				Age	551	47	17	18	88	49	55	18	21	86
	Yes	Highlighting	8.2%***	Male (dummy)		0.48		0	1		0.59		0	1
				Educ_low		0.30		0	1		0.43		0	1
				Educ_med		0.41		0	1		0.41		0	1
				Educ_high		0.29		0	1		0.16		0	1
5				Age	546	49	17	18	98	43	59	15	21	82
	Yes	Shades of purple	7.3%***	Male (dummy)		0.48		0	1		0.56		0	1
				Educ_low		0.31		0	1		0.53		0	1
				Educ_med		0.45		0	1		0.30		0	1
				Educ_high		0.25		0	1		0.16		0	1

Dropouts occurring during the discrete choice experiment choice tasks.

^** Null hypothesis of equal proportions is rejected with p < 0.05 (one‐sided).

^*** Null hypothesis of equal proportions is rejected with p < 0.01 (one‐sided).