Table 2.

Quantification of Swimming Exposure (Mean±SD ^a

Swimming Exposure	Age Group
	8–11 y			12–14 y			15–19 y			Masters
	Negative Caseb	Positive Case	P	Negative Case	Positive Case	P	Negative Case	Positive Case	P	Negative Case	Positive Case	P
Time swum, y	3.48±1.64	3.28±1.75	.74	5.72±2.10	6.56±1.45	.29	7.65±2.94	9.16±1.80	.01	15.36±13.21	22.00±16.76	.13
Time swum per week, h	6.64±2.17	7.83±2.94	.18	9.93±4.34	10.94±4.36	.56	15.94±6.19	16.53±5.54	.71	3.78±1.70	4.77±1.54	.06
Time swum per year, h	189.88±130.58	237.93±213.62	.54	355.81±262.13	396.00±188.25	.69	600.30±392.11	652.02±302.07	.60	163.88±81.22	223.60±81.81	.02

^aIndicates that t values are reported in Appendix 1.

^bCase indicates absence (negative case) or presence (positive case) of shoulder pain, dissatisfaction, and disability.