Table 5.

Effect of travel direction on the impact of jet lag on home defensive performance

Home jet lag
DefenseWestWest P valueAverageEastEast P value
At-bats0.019 ± 0.1430.89735.086 ± 0.0200.102 ± 0.1660.54
Singles−0.111 ± 0.0920.88756.131 ± 0.0130.041 ± 0.1070.35
Doubles0.015 ± 0.0470.37451.802 ± 0.007−0.018 ± 0.0540.63
Triples0.033 ± 0.0140.0095*0.179 ± 0.002−0.01 ± 0.0170.719
Home runs−0.023 ± 0.0360.741.029 ± 0.0050.107 ± 0.0410.005*
Walks−0.074 ± 0.070.85653.303 ± 0.0100.052 ± 0.0810.2605
Strikeouts−0.017 ± 0.0910.4256.795 ± 0.013−0.162 ± 0.1050.062
Stolen bases−0.026 ± 0.0310.8020.637 ± 0.004−0.001 ± 0.0360.5135
Caught stealing0.025 ± 0.0180.9230.285 ± 0.0020.018 ± 0.020.805
Stolen base attempts−0.001 ± 0.0360.5120.922 ± 0.0050.016 ± 0.0420.3475
Sacrifice hits−0.016 ± 0.020.78850.340 ± 0.0030.027 ± 0.0230.1155
Sacrifice flies−0.031 ± 0.0180.9560.286 ± 0.0030.016 ± 0.0210.217
Grounded into double plays0.028 ± 0.0290.8310.796 ± 0.004−0.037 ± 0.0330.1355
Error0.019 ± 0.0280.250.672 ± 0.004−0.067 ± 0.0330.9785
  • Home jet lag shows regression coefficients indicating effects on home defensive performance. Regression coefficients are adjusted for team effects. Parameters are expressed on a per-game basis with error indicating SE of the estimated effect. P values are one tailed, derived from the regression analysis testing whether jet lag adversely impacts performance.

  • * Metrics where P < 0.05. Average is over all 46,535 games.