Table 3. Mean, standard deviation (time), two-way ANOVA (sex, and starting block) with Bonferroni in 50-m and 100-m individual freestyle.

	Time (s)				Block time (s)
	Men (m) (n=829)		Women (w) (n=827)		Men (m) (n=829)				Women (w) (n=827)
	Mean (SD)		Mean (SD)		Mean (SD)				Mean (SD)
50-m freestyle
Old platform (n=509)	22.5 (.41)		25.6 (.55)		.75 (.64)				.77 (.06)
New platform (n=318)	22.1 (.47)		25.1 (.61)		.68 (.44)				.71 (.47)
100-m freestyle
Old platform (n=511)	49.6 (.80)		55.6 (.99)		.76 (.05)				.79 (.06)
New platform (n=318)	48.8 (.82)		54.6 (.94)		.70 (.04)				.73 (.05)
Whole sample by sex and starting block	Sex				Starting block
	Men (m)		Women (w)		Old (a)				New (b)
50-m freestyle	.72 (.07)		.75 (.06)		.76 (.06)				.69 (.05)
100-m freestyle	.74 (.06)		.77 (.06)		.77 (.06)				.72 (.05)
Main effects and interactions	Sex				Starting block			Sex * Starting block
	F	Diff.	p		F	Diff.	p	F	p
50-m freestyle	46.262	m<w	<0.001a		291.859	a>b	<0.001c	.278	.598
100-m freestyle	61.412	m<w	<0.001b		244.563	a>b	<0.001d	1.825	.177

a: effect size=-0.46;b: effect size=-0.50;c: effect size=1.24;d: effect size=0.89