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Table 1 Overview of participating skiers and non-participating controls. Individuals in the dataset divided into gender, age group, year of inclusion, family status, education level, occupational level and Charlson index. Charlson index reflects estimated survival rate in each group [45]

From: Physical Activity Reduces Epilepsy Incidence: a Retrospective Cohort Study in Swedish Cross-Country Skiers and an Experimental Study in Seizure-Prone Synapsin II Knockout Mice

VariableNControlsSkiersTotalP value
N = 197,684N = 197,685N = 395,369
Gender
 Woman395,36974,899 (37.9%)74,897 (37.9%)149,796 (37.9%)0.9911
Age395,36936.0 (29.0–46.0)36.0 (29.0–46.0)36.0 (29.0–46.0)0.3622
 Age group:
  20–30395,36963,238 (32.0%)63,238 (32.0%)126,476 (32.0%)1.001
  30–40 58,246 (29.5%)58,246 (29.5%)116,492 (29.5%) 
  40–50 45,957 (23.2%)45,958 (23.2%)91,915(23.2%) 
  50–100 30,243 (15.3%)30,243 (15.3%)60,486 (15.3%) 
Year395,3692001 (1996–2006)2001 (1996–2006)2001 (1996–2006)1.002
 Year group:
  1991–2000384,60189,517 (46.6%)89,518 (46.6%)179,035 (46.6%) 
  2001–2005 51,752 (26.9%)51,752 (26.9%)103,504 (26.9%) 
  2006–2010 51,031 (26.5%)51,031 (26.5%)102,062 (26.5%) 
Family status:
 Cohabiter384,573108,629 (56.5%)115,757 (60.2%)224,386 (58,3%)< 0.0011*
Educational level
 Primary school392,04834,806 (17.9%)14,538 (7.4%)49,344 (12.6%)< 0.0011*
  High school 99,936 (51.3%)76,635 (38.8%)176,571 (45.0%) 
  University 59,986 (30.8%)106,147 (53.8%)166,133 (42.4%) 
Occupation level
 Employed378,596142,020 (75.5%)162,849 (85.5%)304,869 (80.5%)< 0.0011*
 Unemployed 43,811 (23.3%)25,662 (13.5%)69,473 (18.4%) 
 Retired 2225 (1.2%)2029 (1.1%)4254 (1.1%) 
Charlson index
 02,407,956112,182 (91.7%)111,061 (93.8%)223,243 (92.7%)< 0.0011*
 1 9030 (7.4%)7018 (5.9%)16,048 (6.7%) 
 2 839 (0.7%)322 (0.3%)1161 (0.5%) 
 3 197 (0.2%)53 (0.0%)250 (0.1%) 
 4 43 (0.0%)4 (0.0%)47 (0.0%) 
 5 19 (0.0%)2 (0.0%)21 (0.0%) 
 6 17 (0.0%)4 (0.0%)21 (0.0%) 
 7 2 (0.0%)0 (0.0%)2 (0.0%) 
 8 3 (0.0%)0 (0.0%)3 (0.0%) 
 9 0 (0.0%)0 (0.0%)0 (0.0%) 
  1. Statistics: 1Pearson’s χ2 test; 2Wilcoxon test