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Table 2 Odds ratio and 95% confidence interval for each group

From: Relative Age Effects in Male Japanese Professional Athletes: a 25-Year Historical Analysis

  Year Q1 vs. Q4 Q2 vs. Q4 Q3 vs. Q4 1st vs. 2nd
Soccer 1993 2.19 (1.93–2.48) 1.83 (1.61–2.07) 0.97 (0.86–1.10) 2.04 (1.80–2.31)
2001 2.54 (2.24–2.88) 2.14 (1.89–2.43) 1.40 (1.23–1.59) 1.95 (1.72–2.21)
2010 2.38 (2.10–2.70) 1.96 (1.73–2.22) 1.53 (1.35–1.73) 1.72 (1.52–1.95)
2018 2.06 (1.82–2.34) 1.86 (1.64–2.11) 1.30 (1.15–1.47) 1.71 (1.51–1.94)
Baseball 1993 2.33 (2.06–2.64) 2.18 (1.92–2.47) 1.18 (1.04–1.34) 2.06 (1.82–2.34)
2001 2.59 (2.28–2.94) 2.20 (1.94–2.49) 1.39 (1.23–1.58) 2.01 (1.77–2.28)
2010 2.31 (2.04–2.62) 2.04 (1.80–2.31) 1.68 (1.48–1.90) 1.62 (1.43–1.84)
2018 1.65 (1.46–1.87) 1.51 (1.33–1.71) 1.16 (1.02–1.32) 1.47 (1.30–1.67)
Basketball 2010 1.55 (1.37–1.76) 1.41 (1.24–1.60) 1.13 (1.00–1.28) 1.39 (1.23–1.58)
2018 1.65 (1.46–1.87) 1.49 (1.31–1.69) 1.01 (0.89–1.14) 1.56 (1.38–1.77)
Volleyball 2010 1.70 (1.50–1.93) 1.87 (1.65–2.12) 1.22 (1.08–1.38) 1.6 (1.41–1.81)
2018 1.33 (1.17–1.51) 1.16 (1.02–1.32) 1.23 (1.08–1.39) 1.12 (0.99–1.27)
  1. 1st the first semester (Q1 and Q2), 2nd the second semester (Q3 and Q4)
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