Table 2

Characteristics of ‘cases’ and ‘controls’

Cases (n=612) (%)Controls (n=3027) (%)P values
Gender
 Men88.669.30.000
 Women11.430.6
Age groups (years)
 <2533.216.20.000
 25–3438.216.00.000
 35–4411.818.30.000
 45–548.720.20.000
 55–644.117.00.000
  >644.112.30.000
Season
 Spring (March–May)25.326.20.664
 Summer (June–August)30.711.60.000
 Autumn (September–November)23.837.20.000
 Winter (December–February)20.125.00.015
Time of day
 Day (08:00–19:59)36.863.80.000
 Night (20:00–07:59)63.236.2