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Table 1 Incidence rate (95% CI) of heat- and cold-related illnesses by participants’ characteristics

From: Association between income levels and prevalence of heat- and cold-related illnesses in Korean adults

Income level 10,000 Person-year Heat-related illnesses Cold-related illnesses
Low Middle High Low (n = 1,618) Middle (n = 2,279) High (n = 1,169) Low (n = 1,172) Middle (n = 1,437) High (n = 731)
Age (year)
 20–64 152.4 227.9 121.2 9.1 (8.6–9.5) 8.6 (8.3–9.0) 8.0 (7.5–8.5) 6.9 (6.5–7.4) 5.8 (5.5–6.1) 5.3 (4.9–5.8)
 65+ 12.8 18.8 14.1 18.6 (16.2–20.9) 16.6 (14.8–18.4) 14.3 (12.3–16.3) 6.0 (4.7–7.3) 5.7 (4.7–6.8) 5.9 (4.6–7.1)
Sex
 Male 75.5 125.1 69.1 8.5 (7.8–9.1) 8.2 (7.7–8.7) 7.3 (6.7–8.0) 6.1 (5.5–6.6) 4.9 (4.5–5.3) 4.5 (4.0–5.0)
 Female 89.8 121.6 66.2 10.9 (10.2–11.6) 10.3 (9.7–10.8) 10.0 (9.3–10.8) 7.5 (7.0–8.1) 6.8 (6.3–7.3) 6.3 (5.7–6.9)
Smoking status
 Current smoker 46.5 67.0 30.6 7.7 (6.9–8.5) 8.0 (7.3–8.7) 7.6 (6.6–8.6) 5.3 (4.7–6.0) 4.5 (4.0–5.0) 4.3 (3.5–5.0)
 Former smoker 12.7 22.6 14.1 9.8 (8.0–11.5) 7.4 (6.3–8.5) 7.0 (5.6–8.4) 6.9 (5.4–8.3) 5.1 (4.2–6.0) 4.4 (3.3–5.5)
 Never smoker 106.1 157.1 90.6 10.7 (10.1–11.4) 10.0 (9.5–10.5) 9.2 (8.6–9.9) 7.5 (7.0–8.1) 6.5 (6.1–6.9) 6.0 (5.4–6.5)
Current alcohol consumption
 No 86.8 128.9 73.5 11.1 (10.4–11.8) 10.5 (10.0–11.1) 9.5 (8.8–10.2) 7.3 (6.8–7.9) 6.2 (5.7–6.6) 5.8 (5.3–6.4)
 Yes 78.5 117.8 61.8 8.3 (7.7–8.9) 7.8 (7.3–8.3) 7.6 (6.9–8.3) 6.3 (5.8–6.9) 5.4 (5.0–5.9) 4.9 (4.4–5.5)
Exercise
 No 99.4 140.6 68.3 10.5 (9.8–11.1) 9.8 (9.3–10.3) 9.5 (8.8–10.3) 6.9 (6.3–7.4) 6.2 (5.8–6.6) 6.0 (5.4–6.6)
 Yes 65.9 106.1 67.0 8.8 (8.0–9.5) 8.5 (8.0–9.1) 7.7 (7.1–8.4) 6.9 (6.2–7.5) 5.3 (4.9–5.7) 4.8 (4.2–5.3)
BMI categories
 Underweight 8.1 9.7 4.7 9.8 (7.7–12.0) 7.6 (5.9–9.4) 11.6 (8.5–14.7) 9.1 (7.0–11.2) 8.9 (7.0–10.7) 8.1 (5.5–10.7)
 Normal weight 106.3 157.2 85.4 9.5 (8.9–10.1) 9.2 (8.7–9.6) 8.4 (7.8–9.0) 7.6 (7.1–8.1) 6.6 (6.2–7.0) 6.0 (5.5–6.6)
 Overweight 44.4 70.8 40.7 10.4 (9.4–11.4) 9.6 (8.9–10.4) 8.8 (7.9–9.7) 5.1 (4.5–5.8) 4.1 (3.7–4.6) 4.0 (3.4–4.6)
 Obese 6.4 9.1 4.5 10.5 (8.0–13.1) 8.8 (6.9–10.8) 8.8 (6.1–11.6) 3.8 (2.3–5.3) 2.9 (1.8–4.0) 2.9 (1.3–4.4)
High Blood Pressure
 No 143.7 215.2 117.8 9.7 (9.2–10.2) 9.1 (8.7–9.5) 8.5 (7.9–9.0) 7.2 (6.7–7.6) 6.1 (5.7–6.4) 5.6 (5.2–6.1)
 Yes 21.5 31.5 17.5 10.4 (9.0–11.7) 10.1 (9.0–11.2) 9.8 (8.3–11.2) 4.9 (4.0–5.9) 4.2 (3.5–4.9) 3.8 (2.9–4.7)
Hyperglycemia
 No 154.8 231.4 126.4 9.7 (9.2–10.2) 9.1 (8.8–9.5) 8.6 (8.1–9.1) 6.9 (6.4–7.3) 5.9 (5.6–6.3) 5.5 (5.1–5.9)
 Yes 10.4 15.3 8.9 10.9 (8.9–13.0) 10.6 (8.9–12.2) 9.1 (7.1–11.1) 6.8 (5.2–8.4) 4.0 (3.0–5.0) 4.6 (3.2–6.0)
  1. BMI body mass index