Table 1 Number of frames automatically tr acked and number of manual interventions for each software and underwater movement.

Movement	Software	Automatic tr acks	Manual interventions	Percentage of manual interventions	Odds ratio	95% CI
Front crawl swimming	DVP COM	556 432	95 219	14.6 33.6	.34 *	.26 – .44
Elliptical machine	DVP COM	244 158	50 136	17.0 46.3	.24 *	.16 – .35
Towed swimming	DVP COM	494 496	2 0	0.4 0.0	≈ž	1 – ≈ž
Flutter kick swimming	DVP COM	332 310	57 79	14.7 20.3	.67 *	.46 – .98
Treadmill	DVP COM	506 473	4 37	0.8 7.3	.10*	.04 – .29
Walking	DVP COM	591 547	9 53	1.5 8.8	.16 *	.08 – .32
Total	DVP COM	2723 2416	217 524	7.4 17.8	.37 *	.31 – .44

CI, confidence interval for odds ratio.* p 0.05, significantly different from 1