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Demographic data.

Demographic dataNumber of study participants (%)
Geographical Army area (n = 809)
    • Average (min.-max.) temperature and humidity (May-June 2013)
Central (Lop Buri province)315 (38.9)
    • Temperature = 29.7°C (22.8–39.7°C)
    • Humidity = 70% (28–99%)
Northern (Chiang Mai province)163 (20.2)
    • Temperature = 29.0°C (21.8–40.3°C)
    • Humidity = 67% (24–98%)
Bangkok Metropolitan Region136 (16.8)
    • Temperature = 29.6°C (23.0–38.8°C)
    • Humidity = 76% (35–96%)
North-Eastern (Ubon Ratchathani province)129 (15.9)
    • Temperature = 27.7°C (20.4–36.8°C)
    • Humidity = 71% (31–89%)
Southern (Songkhla province)66 (8.2)
    • Temperature = 27.4°C (21.7–35.6°C)
    • Humidity = 83% (45–100%)
Age (yrs)–mean±SD
Body mass index (kg/m2) (n = 743)
<18.576 (10.2)
18.5–22.9434 (58.5)
23.0–24.996 (12.9)
25.0–29.996 (12.9)
≥30.041 (5.5)
Occupation prior to conscription (n = 765)
Unemployed62 (8.1)
Student115 (15.0)
Farmer (farming, gardening, or animals)219 (28.6)
Employee180 (23.5)
Laborer74 (9.7)
Merchant51 (6.7)
Others64 (8.4)
Occupation group prior to conscription(n = 701)
Indoor (unemployed, student, employee, or merchant)408 (58.2)
Outdoor (Farmer or Laborer)293 (41.8)
Smoking in the past 12 months
Current smoker516 (67.5)
Ex-smoker56 (7.3)
Never smoked193 (25.2)
Exercise in the past 12 months (at least 3 days per week)
Yes289 (39.8)
No437 (60.2)