BMC Research Notes

Table 3 Multiple linear regression analysis of swimming performance, i.e. FINA points, as dependent variable and competition (comp.) age [years], relative age [month of birth], and chronological (chronol.) age [years] as predictors with standardized (beta_i) and unstandardized (b_i) regression coefficients in female swimmers

From: Competition age: does it matter for swimmers?

Regression model					Regression coefficients
n	R²	F	p		beta_i	b_i	t_i	p
All events				Comp. age	0.34	22.9	71	< 0.001
39,572	0.20	F_(3\|39568) = 3361	< 0.001	Relative age	0.09	4.5	21	< 0.001
				Chronol. age	0.18	5.3	37	< 0.001
Butterfly				Comp. age	0.21	12.2	35	< 0.001
26,925	0.28	F_(3\|26921) = 3436	< 0.001	Relative age	0.04	1.9	8	< 0.001
				Chronol. age	0.38	16.3	63	< 0.001
Backstroke				Comp. age	0.25	15.9	42	< 0.001
26,136	0.28	F_(3\|26132) = 3456	< 0.001	Relative age	0.06	2.4	10	< 0.001
				Chronol. age	0.35	14.0	58	< 0.001
Breaststroke				Comp. age	0.28	17.0	45	< 0.001
23,676	0.26	F_(3\|23672) = 2754	< 0.001	Relative age	0.04	1.8	8	< 0.001
				Chronol. age	0.31	10.8	50	< 0.001
Freestyle				Comp. age	0.32	20.3	64	< 0.001
36,037	0.26	F_(3\|36033) = 4184	< 0.001	Relative age	0.06	2.8	13	< 0.001
				Chronol. age	0.27	9.3	54	< 0.001
Individual medley				Comp. age	0.14	7.4	18	< 0.001
18,263	0.25	F_(3\|18259) = 2070	< 0.001	Relative age	0.06	2.4	10	< 0.001
				Chronol. age	0.40	17.4	53	< 0.001
50 m Freestyle				Comp. age	0.33	18.6	62	< 0.001
31,906	0.29	F_(3\|31902) = 4319	< 0.001	Relative age	0.03	1.1	5	< 0.001
				Chronol. age	0.30	10.2	56	< 0.001
100 m Freestyle				Comp. age	0.24	14.2	42	< 0.001
29,808	0.32	F_(3\|29804) = 4583	< 0.001	Relative age	0.04	1.6	7	< 0.001
				Chronol. age	0.39	16.6	69	< 0.001
200 m Freestyle				Comp. age	0.20	11.4	28	< 0.001
21,365	0.26	F_(3\|21361) = 2431	< 0.001	Relative age	0.05	2.2	8	< 0.001
				Chronol. age	0.37	16.1	53	< 0.001
400 m Freestyle				Comp. age	0.26	14.4	32	< 0.001
14,646	0.11	F_(3\|14642) = 595	< 0.001	Relative age	0.08	3.3	10	< 0.001
				Chronol. age	0.10	3.0	12	< 0.001
800 m Freestyle				Comp. age	0.25	12.4	22	< 0.001
8104	0.07	F_(3\|8100) = 215	< 0.001	Relative age	0.08	3.3	8	< 0.001
				Chronol. age	− 0.13	− 2.7	− 12	< 0.001
1500 m Freestyle				Comp. age	0.19	8.8	14	< 0.001
5654	0.05	F_(3\|5650) = 89	< 0.001	Relative age	0.06	2.4	5	< 0.001
				Chronol. age	− 0.13	− 3.3	− 10	< 0.001

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ISSN: 1756-0500

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