BMC Research Notes

Table 2 Multiple linear regression analysis of swimming performance, i.e. FINA points, as dependent variable and competition (comp.) [years] age, relative age [month of birth], and chronological (chronol.) [years] age as predictors with standardized (beta_i) and unstandardized (b_i) regression coefficients in male 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	24.6	74	< 0.001
39,487	0.25	F_(3\|39483) = 4326	< 0.001	Relative age	0.08	4.2	18	< 0.001
				Chronol. age	0.24	7.0	52	< 0.001
Butterfly				Comp. age	0.24	14.3	54	< 0.001
42,926	0.29	F_(3\|42922) = 5897	< 0.001	Relative age	0.03	1.6	8	< 0.001
				Chronol. age	0.39	13.0	86	< 0.001
Backstroke				Comp. age	0.24	15.5	39	< 0.001
23,603	0.36	F_(3\|23599) = 4400	< 0.001	Relative age	0.04	1.8	7	< 0.001
				Chronol. age	0.44	16.7	72	< 0.001
Breaststroke				Comp. age	0.28	17.5	46	< 0.001
22,258	0.34	F_(3\|22254) = 3878	< 0.001	Relative age	0.04	1.8	7	< 0.001
				Chronol. age	0.40	13.4	66	< 0.001
Freestyle				Comp. age	0.33	22.0	69	< 0.001
34,759	0.32	F_(3\|34755) = 5502	< 0.001	Relative age	0.05	2.5	11	< 0.001
				Chronol. age	0.34	10.9	70	< 0.001
Individual medley				Comp. age	0.14	7.7	18	< 0.001
16,070	0.33	F_(3\|16066) = 2635	< 0.001	Relative age	0.04	1.8	6	< 0.001
				Chronol. age	0.48	20.4	63	< 0.001
50 m Freestyle				Comp. age	0.33	19.7	85	< 0.001
52,043	0.30	F_(3\|52039) = 7304	< 0.001	Relative age	0.03	1.5	9	< 0.001
				Chronol. age	0.32	8.1	82	< 0.001
100 m Freestyle				Comp. age	0.24	15.6	45	< 0.001
28,309	0.40	F_(3\|28305) = 6390	< 0.001	Relative age	0.02	0.9	4	< 0.001
				Chronol. age	0.48	20.0	89	< 0.001
200 m Freestyle				Comp. age	0.21	12.6	32	< 0.001
20,225	0.33	F_(3\|20221) = 3279	< 0.001	Relative age	0.03	1.5	6	< 0.001
				Chronol. age	0.43	18.3	65	< 0.001
400 m Freestyle				Comp. age	0.26	15.0	31	< 0.001
14,005	0.11	F_(3\|14001) = 570	< 0.001	Relative age	0.09	4.0	11	< 0.001
				Chronol. age	0.11	3.3	14	< 0.001
800 m Freestyle				Comp. age	0.23	11.8	20	< 0.001
7695	0.07	F_(3\|7691) = 195	< 0.001	Relative age	0.11	4.8	10	< 0.001
				Chronol. age	− 0.12	− 2.4	− 11	< 0.001
1500 m Freestyle				Comp. age	0.22	11.5	17	< 0.001
5466	0.07	F_(3\|5462) = 130	< 0.001	Relative age	0.11	4.8	9	< 0.001
				Chronol. age	− 0.10	− 2.3	− 7	< 0.001

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ISSN: 1756-0500

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