. 2020 Nov 18;15(11):e0242442. doi: 10.1371/journal.pone.0242442

Table 2. Pearson correlation (r) between number of races per year and ranking at the 2018 European Long-Course Swimming Championships with corresponding statistical significance (p) in italic letters for all ten years prior to the championships.

	2018	2017	2016	2015	2014	2013	2012	2011	2010	2009
All strokes and distances	-0.22 ^***	-0.28 ^***	-0.29 ^***	-0.32 ^***	-0.25 ^***	-0.23 ^***	-0.26 ^***	-0.21 ^***	-0.28 ^***	-0.25 ^***
All strokes and distances	10.9±5.0	10.2±4.9	9.7±4.5	10.2±5.7	9.4±5.2	8.6±4.9	7.7±4.4	7.9±4.6	7.6±4.5	7.3±4.4
Butterfly	-0.37 ^***	-0.43 ^***	-0.44 ^***	-0.29 ^**	-0.29 ^*	-0.30 ^*	-0.35 ^**	-0.31 ^*	-0.36 ^*	-0.34 ^*
	11.7±5.6	10.9±5.2	9.5±4.9	10.4±5.6	9.5±4.9	8.6±4.6	7.7±4.2	7.7±4.3	7.0±3.8	7.4±3.7
Backstroke	-0.43 ^***	-0.41 ^***	-0.44 ^***	-0.43 ^***	-0.42 ^***	-0.14	-0.21	-0.03	-0.01	-0.07
	10.8±4.9	10.2±4.7	9.7±4.5	10.6±6.1	10.1±5.4	9.1±5.1	8.1±4.1	8.5±4.4	8.4±4.4	7.1±4.7
Breaststroke	-0.29 ^**	-0.31 ^**	-0.21 ^*	-0.22 ^*	-0.28 ^**	-0.23 ^*	-0.14	-0.30 ^**	-0.25 ^*	-0.36 ^**
	11.8±5.2	10.9±4.7	10.0±4.1	10.9±5.3	10.7±5.8	9.1±5.0	7.9±4.3	8.3±4.8	8.1±5.1	7.3±4.4
Freestyle	-0.32 ^***	-0.46 ^***	-0.41 ^***	-0.44 ^***	-0.27 ^**	-0.35 ^***	-0.42 ^***	-0.29 ^**	-0.46 ^***	-0.19
	11.3±4.9	10.5±4.9	10.0±4.6	9.6±5.2	8.9±5.2	8.1±4.7	7.4±4.5	7.5±4.6	6.7±3.9	6.5±4.2
Individual medley	-0.31	-0.20	-0.50 ^*	-0.57 ^**	-0.65 ^**	-0.44	-0.42	-0.38	-0.38	-0.59
	10.6±3.9	10.6±5.1	11.0±5.6	13.3±9.1	8.3±5.0	8.1±5.1	6.5±3.0	7.3±4.3	7.3±4.4	8.1±5.1
50m	-0.35 ^*	-0.51 ^***	-0.53 ^***	-0.54 ^***	-0.35 ^*	-0.46 ^**	-0.38 ^*	-0.206	-0.42 ^*	0.19
	10.9±4.7	10.7±5.6	9.8±4.5	9.8±5.2	9.1±4.3	8.8±4.9	7.6±4.6	7.7±4.3	6.3±3.6	6.0±3.3
100m	-0.31 ^*	-0.53 ^***	-0.36 ^*	-0.40 ^**	-0.15	-0.27	-0.39 ^*	-0.23	-0.49 ^*	-0.14
	11.3±5.5	10.1±4.9	10.2±5.0	9.2±5.5	9.1±5.6	8.1±4.5	8.2±4.5	8.4±4.9	7.4±4.3	6.7±4.2
200m	-0.30 ^*	-0.27	-0.34 ^*	-0.38 ^*	-0.34 ^*	-0.35 ^*	-0.62 ^***	-0.53 ^*	-0.60 ^*	-0.58 ^*
	11.8±4.5	10.7±4.0	10.0±4.6	9.7±4.9	8.4±5.9	7.4±4.6	6.1±4.3	6.1±4.5	6.1±3.9	6.8±5.5
400m	-0.12	-0.32	-0.26	-0.57 ^**	-0.38	-0.58 ^**	-0.26	-0.30	-0.85 ^**	-0.39
	9.5±4.2	9.9±5.1	9.8±4.6	8.8±4.8	8.2±4.2	8.6±6.1	9.2±7.4	8.8±7.2	11.1±7.1	13.8±4.8
800m	0.05	-0.09	0.12	-0.32	-0.20	-0.21	0.36	-0.06	-0.01	-0.55
	7.2±2.8	6.4±2.9	7.1±2.8	6.3±2.4	5.9±2.8	7.1±3.7	6.3±3.9	6.4±3.2	8.2±4.8	8.6±3.7
1500m	-0.36	-0.17	0.00	-0.11	-0.33	0.78	^†	-0.14	^†	-0.14
	4.8±1.9	4.6±1.7	3.8±1.5	3.3±1.2	4.8±0.8	3.2±1.3	3.0±1.4	3.3±1.5	5.5±2.1	4.3±1.5

* P < 0.05.

** P < 0.01.

*** P < 0.001.

† Number of observations < 3.