Table 4.

Sample-Size Estimates for Comparing 5-Minute Wetted Lengths Between Two Groups

Source	Variance, σ2	Minimum Difference of Interest, mm
		1	2	3	5	10
Smallest σ2 from literature (Lee, 1988)20	19.536	308	78	36	14	4
Smallest σ2, current study (2018)	22.279	350	88	40	14	4
Largest σ2 current study (2018)	94.743	1488	372	166	60	16
Largest σ2 from literature (Lira, 2011)19	112.36	1764	442	196	72	18