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Table 1 Sample summary statistics

From: Evolving consumer trends for whey protein sports supplements: the Heckman ordered probit estimation

Variable Percentage (%)
Gender
 Female 45.71
 Male 54.29
Age
 Age (≤ 25) 52.94
 Age (26–35) 29.42
 Age (> 36) 17.64
Gross income
 Income (< 30,000 euro) 39.60
 Income (30,000–50,000) 44.56
 Income (> 50,001–70,000) 13.86
 Income (> 70,001) 6.93
Employment
 Full-time employed 43.27
 Part-time employed 14.42
 Others (including full-time, third-level students) 42.31
Exercise hours per week
 Up to 3 h 23.30
 3 to 6 h 38.83
 More than 6 h 37.87
Main type of exercise
 Endurance 61
 Power and strength 12
 Flexibility 27
When started using whey protein
 Within the last year 40
 1–4 years ago 45
 > 5 years ago 15