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Table 3 Percentage of men staying within baseline weight category versus switching to another category

From: Changes in body mass index in Canadians over a five-year period: Results of a prospective, population-based study

Age at baseline(years) Category at Baseline Underweight At Year 5 (95% CI) Normal Weight At Year 5 (95% CI) Overweight At Year 5 (95% CI) Obese Class I At Year 5 (95% CI) Obese Class II At year 5 (95% CI) Obese Class III At Year 5 (95% CI)
25 – 34 Underweight 21.2 (0.0–77.3) 60.5 (8.6–100.0) 3.9 (0.0–25.0) 3.6 (0.0–22.1) 3.4 (0.0–21.8) 7.4 (0.0–39.3)
  Normal Weight 1.2 (0.0–4.5) 67.9 (57.0–78.7) 30.3 (19.9–41.0) 0.2 (0.0–1.3) 0.1 (0.0–0.6) 0.2 (0.0–1.2)
  Overweight 0.1 (0.0–0.7) 13.1 (5.8–21.4) 71.1 (59.4–82.2) 15.2 (6.3–24.5) 0.2 (0.0–1.4) 0.2 (0.0–1.3)
  Obese Class I 0.5 (0.0–3.1) 0.5 (0.0–3.3) 3.5 (0.0–15.6) 68.2 (44.0–90.7) 26.0 (5.2–48.3) 1.2 (0.0–6.2)
  Obese Class II 2.6 (0.0–16.2) 2.7 (0.0–16.3) 2.7 (0.0–17.1) 5.9 (0.0–36.6) 50.2 (5.8–94.9) 35.9 (0.1–80.0)
  Obese Class III 5.8 (0.0–37.5) 5.7 (0.0–36.6) 6.0 (0.0–39.8) 5.8 (0.0–38.4) 6.1 (0.0–38.5) 70.6 (14.4–100.0)
35 – 44 Underweight 18.1 (0.0–74.9) 62.9 (9.5–100.0) 4.2 (0.0–27.2) 3.7 (0.0–24.1) 3.7 (0.0–23.1) 7.3 (0.0–37.1)
  Normal Weight 0.5 (0.0–2.8) 62.7 (49.6–76.5) 34.4 (21.3–47.9) 0.6 (0.0–3.0) 1.6 (0.0–4.5) 0.3 (0.0–1.5)
  Overweight 0.1 (0.0–0.6) 7.3 (2.0–13.5) 79.1 (69.6–87.9) 13.0 (6.0–20.9) 0.2 (0.0–1.0) 0.2 (0.0–1.1)
  Obese Class I 0.3 (0.0–2.1) 0.4 (0.0–2.4) 17.2 (3.5–32.9) 73.1 (54.2–90.7) 8.3 (0.0–20.0) 0.7 (0.0–3.7)
  Obese Class II 1.8 (0.0–11.0) 1.8 (0.0–10.8) 1.8 (0.0–10.7) 2.3 (0.0–14.3) 49.3 (11.3–87.8) 43.0 (6.3–81.1)
  Obese Class III 2.6 (0.0–16.5) 2.7 (0.0–16.7) 2.9 (0.0–17.9) 2.7 (0.0–16.9) 8.1 (0.0–46.4) 81.0 (37.0–100.0)
45 – 54 Underweight 36.3 (0.0–98.2) 34.3 (0.0–98.1) 5.9 (0.0–38.7) 5.7 (0.0–37.6) 6.0 (0.0–38.3) 11.8 (0.0–58.1)
  Normal Weight 1.4 (0.0–3.5) 73.9 (66.1–81.4) 23.9 (16.7–31.5) 0.7 (0.0–2.1) 0.1 (0.0–0.4) 0.1 (0.0–0.6)
  Overweight 0.0 (0.0–0.2) 9.9 (6.1–13.7) 76.6 (71.4–82.0) 13.0 (8.8–17.2) 0.4 (0.0–1.1) 0.1 (0.0–0.4)
  Obese Class I 0.1 (0.0–0.7) 0.1 (0.0–0.7) 19.8 (11.5–29.4) 68.7 (57.9–79.1) 11.1 (4.4–18.3) 0.2 (0.0–1.1)
  Obese Class II 0.4 (0.0–2.3) 0.4 (0.0–2.3) 4.3 (0.0–12.1) 12.4 (0.7–26.1) 72.1 (53.9–90.3) 10.4 (0.9–23.0)
  Obese Class III 2.1 (0.0–13.4) 2.1 (0.0–13.2) 2.1 (0.0–13.3) 2.2 (0.0–13.6) 34.5 (0.0–77.3) 56.9 (15.4–99.0)
55 – 64 Underweight 40.7 (0.3–85.2) 40.9 (0.1–85.6) 3.8 (0.0–23.8) 3.7 (0.0–23.2) 3.6 (0.0–23.2) 7.4 (0.0–39.3)
  Normal Weight 0.2 (0.0–1.4) 74.0 (66.2–81.6) 24.7 (17.4–32.6) 0.9 (0.0–2.5) 0.1 (0.0–0.5) 0.2 (0.0–0.8)
  Overweight 0.0 (0.0–0.2) 9.7 (6.3–13.5) 78.0 (72.9–82.9) 12.2 (8.4–16.1) 0.0 (0.0–0.3) 0.1 (0.0–0.3)
  Obese Class I 0.9 (0.0–2.5) 0.1 (0.0–0.6) 21.5 (13.6–29.5) 67.1 (58.0–76.1) 10.3 (5.0–16.4) 0.2 (0.0–0.9)
  Obese Class II 0.4 (0.0–2.3) 0.4 (0.0–2.2) 0.5 (0.0–2.6) 16.0 (2.8–30.5) 72.8 (54.4–89.5) 10.0 (0.6–21.7)
  Obese Class III 2.2 (0.0–13.4) 2.1 (0.0–12.8) 2.1 (0.0–12.7) 23.8 (0.0–59.2) 29.3 (0.0–76.9) 40.5 (0.0–85.5)
65 – 74 Underweight 29.6 (0.0–69.7) 57.1 (16.4–96.5) 2.5 (0.0–15.7) 2.8 (0.0–17.1) 2.6 (0.0–16.4) 5.4 (0.0–27.6)
  Normal Weight 0.5 (0.0–1.8) 86.2 (80.7–91.5) 13.1 (8.0–18.5) 0.1 (0.0–0.4) 0.1 (0.0–0.3) 0.1 (0.0–0.5)
  Overweight 0.3 (0.0–0.9) 13.1 (9.3–16.8) 80.1 (75.4–84.4) 6.5 (3.7–9.2) 0.0 (0.0–0.2) 0.1 (0.0–0.3)
  Obese Class I 0.1 (0.0–0.5) 0.9 (0.0–2.6) 21.3 (13.8–29.4) 71.3 (62.5–79.7) 6.2 (2.2–11.0) 0.2 (0.0–0.8)
  Obese Class II 0.8 (0.0–5.0) 0.9 (0.0–5.0) 9.5 (0.0–26.1) 24.2 (2.3–49.6) 62.3 (34.8–90.6) 2.3 (0.0–12.2)
  Obese Class III 1.5 (0.0–8.6) 1.5 (0.0–9.2) 1.5 (0.0–9.4) 1.5 (0.0–8.7) 31.4 (3.0–63.4) 62.7 (29.2–93.9)
75 + Underweight 62.6 (9.0–100.0) 18.8 (0.0–74.9) 3.8 (0.0–23.6) 3.6 (0.0–22.9) 3.8 (0.0–23.4) 7.4 (0.0–38.4)
  Normal Weight 4.0 (0.2–8.5) 87.3 (80.0–94.3) 7.5 (2.2–13.4) 0.9 (0.0–2.6) 0.1 (0.0–0.5) 0.2 (0.0–0.9)
  Overweight 0.1 (0.0–0.4) 24.3 (16.5–32.3) 68.7 (60.0–77.0) 6.7 (2.4–11.3) 0.1 (0.0–0.4) 0.1 (0.0–0.8)
  Obese Class I 0.3 (0.0–1.7) 0.4 (0.0–2.2) 23.2 (7.6–38.6) 70.1 (52.6–86.6) 5.4 (0.0–14.4) 0.6 (0.0–3.2)
  Obese Class II 1.5 (0.0–9.1) 1.5 (0.0–8.8) 16.5 (0.0–43.2) 35.5 (0.1–74.4) 40.5 (0.0–78.0) 4.5 (0.0–23.1)
  Obese Class III 3.7 (0.0–23.7) 3.5 (0.0–22.5) 3.8 (0.0–24.3) 3.7 (0.0–23.7) 18.2 (0.0–74.8) 67.0 (12.2–100.0)
  1. CI = Confidence Interval
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