Table 6.

Effect of travel direction on the impact of jet lag on away aggregate defensive performance

Away jet lag
DefenseWestWest P valueAverageEastEast P value
At-bats−0.097 ± 0.1120.38833.497 ± 0.0190.005 ± 0.1240.968
Singles0.098 ± 0.0720.0866.017 ± 0.0120.044 ± 0.0790.2885
Doubles−0.053 ± 0.0370.92551.769 ± 0.0060.004 ± 0.0410.464
Triples−0.002 ± 0.0120.55350.205 ± 0.002−0.014 ± 0.0140.8415
Home runs−0.004 ± 0.0280.55851.033 ± 0.0050.073 ± 0.0310.0095*
Walks0.129 ± 0.0580.013*3.435 ± 0.0100.017 ± 0.0640.3925
Strikeouts−0.074 ± 0.0720.15456.202 ± 0.013−0.019 ± 0.080.4075
Stolen bases0.027 ± 0.0250.13650.634 ± 0.0040.013 ± 0.0280.3205
Caught stealing0.016 ± 0.0140.88150.262 ± 0.002−0.006 ± 0.0150.3345
Stolen base attempts0.044 ± 0.0290.0660.896 ± 0.0050.006 ± 0.0320.4205
Sacrifice hits0.023 ± 0.0160.0750.348 ± 0.003−0.01 ± 0.0180.7075
Sacrifice flies0.019 ± 0.0150.09850.295 ± 0.003−0.005 ± 0.0160.61
Grounded into double plays0.007 ± 0.0230.6220.762 ± 0.0040.028 ± 0.0250.871
Error−0.008 ± 0.0230.62850.675 ± 0.0040.027 ± 0.0250.144
  • Away jet lag shows regression coefficients indicating effects on away defensive performance. Regression coefficients are adjusted for team effects. Parameters are expressed on a per game basis with error indicates 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.