Table 1. Analysis of birth dates distribution by quarter of Polish youth basketball players between 2013 and 2016.
Q1 (%) Q2 (%) Q3 (%) Q4 (%) TOTAL χ²3 p V Effect
U 14 430 (35.02) 319 (25.98) 304 (24.75) 175 (14.25) 1228 56.92 <.0001 .15 small
U 16 318 (34.49) 269 (29.18) 207 (22.45) 128 (13.88) 922 47.55 <.0001 .16 medium
U 18 268 (29.78) 270 (30.00) 213 (23.67) 149 (16.55) 900 23.61 <.0001 .11 small
U 22 107 (29.00) 113 (30.62) 82 (22.22) 67 (18.16) 369 7.81 <.05 .10 small
U 14 468 (38.27) 361 (29.52) 247 (20.19) 147 (12.02) 1223 101.26 <.0001 .20 medium
U 16 388 (41.86) 271 (29.23) 179 (19.31) 89 (9.60) 927 112.98 <.0001 .25 medium
U 18 341 (37.60) 276 (30.43) 178 (19.62) 112 (12.35) 907 72.70 <.0001 .20 medium
U 20 277 (34.98) 213 (26.89) 171 (21.59) 131 (16.54) 792 29.31 <.0001 .14 medium
χ²3 – chi-squared test value; p – probability value; V – Cramer`s V value