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Table 4 Percentage of women 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 54.4 (18.1–89.8) 36.8 (3.4–72.2) 1.7 (0.0–10.4) 1.8 (0.0–11.3) 1.8 (0.0–10.7) 3.5 (0.0–18.2)
  Normal Weight 1.0 (0.0–3.7) 75.5 (65.9–84.4) 22.8 (13.7–31.8) 0.4 (0.0–2.0) 0.1 (0.0–0.5) 0.2 (0.0–1.0)
  Overweight 0.2 (0.0–1.1) 10.5 (2.6–19.7) 56.9 (41.5–71.4) 29.5 (16.2–43.2) 2.5 (0.0–7.0) 0.4 (0.0–2.0)
  Obese Class I 0.6 (0.0–3.5) 0.7 (0.0–4.2) 24.5 (4.5–47.1) 51.6 (24.9–75.8) 8.6 (0.0–23.7) 14.0 (0.7–30.7)
  Obese Class II 0.9 (0.0–5.5) 1.0 (0.0–5.9) 1.0 (0.0–5.6) 14.6 (0.0–37.7) 57.7 (29.0–88.6) 24.8 (1.8–50.2)
  Obese Class III 1.5 (0.0–9.2) 1.5 (0.0–9.1) 1.5 (0.0–9.0) 1.6 (0.0–9.3) 34.5 (3.1–68.5) 59.3 (23.8–92.3)
35 – 44 Underweight 2.5 (0.0–15.5) 84.1 (48.6–100.0) 2.6 (0.0–15.4) 2.7 (0.0–16.5) 2.7 (0.0–16.9) 5.4 (0.0–28.3)
  Normal Weight 2.1 (0.1–4.6) 82.7 (76.3–89.1) 13.6 (7.8–19.3) 1.4 (0.1–3.4) 0.1 (0.0–0.4) 0.1 (0.0–0.7)
  Overweight 0.2 (0.0–0.9) 12.5 (4.6–21.4) 58.3 (45.2–70.6) 28.5 (17.8–40.4) 0.3 (0.0–1.9) 0.3 (0.0–1.6)
  Obese Class I 0.3 (0.0–1.6) 0.3 (0.0–2.1) 12.5 (2.1–24.9) 59.8 (42.0–77.6) 26.2 (10.9–42.8) 0.9 (0.0–4.5)
  Obese Class II 1.3 (0.0–7.6) 1.4 (0.0–8.3) 1.4 (0.0–8.0) 20.9 (0.0–52.3) 58.9 (22.4–96.4) 16.3 (0.0–47.8)
  Obese Class III 1.0 (0.0–5.8) 1.0 (0.0–5.9) 1.1 (0.0–6.5) 1.0 (0.0–6.3) 24.3 (0.9–50.3) 71.6 (43.4–96.5)
45 – 54 Underweight 56.9 (28.8–84.3) 38.5 (12.3–65.9) 0.9 (0.0–5.6) 1.0 (0.0–6.1) 0.9 (0.0–5.1) 1.9 (0.0–9.9)
  Normal Weight 1.4 (0.3–2.7) 78.7 (74.5–82.8) 19.3 (15.3–23.1) 0.6 (0.0–1.3) 0.0 (0.0–0.1) 0.0 (0.0–0.2)
  Overweight 0.0 (0.0–0.2) 9.7 (6.6–13.2) 68.2 (62.8–73.2) 20.7 (16.4–25.3) 1.4 (0.4–2.7) 0.1 (0.0–0.3)
  Obese Class I 0.1 (0.0–0.4) 0.7 (0.0–2.1) 21.3 (14.5–28.4) 61.3 (53.2–69.5) 15.8 (9.7–22.0) 0.8 (0.0–2.2)
  Obese Class II 0.1 (0.0–0.7) 0.1 (0.0–0.7) 7.5 (2.6–13.4) 14.4 (6.4–22.8) 54.7 (43.0–65.7) 23.1 (14.0–32.6)
  Obese Class III 0.4 (0.0–2.6) 0.4 (0.0–2.4) 0.4 (0.0–2.6) 0.6 (0.0–3.7) 17.8 (1.8–35.4) 80.4 (62.3–96.8)
55 – 64 Underweight 51.2 (28.4–74.2) 46.3 (23.5–68.9) 0.5 (0.0–3.0) 0.5 (0.0–2.9) 0.5 (0.0–3.1) 1.0 (0.0–5.3)
  Normal Weight 3.0 (1.5–4.7) 73.9 (69.8–77.7) 22.4 (18.7–26.2) 0.6 (0.1–1.4) 0.0 (0.0–0.1) 0.0 (0.0–0.2)
  Overweight 0.3 (0.0–0.8) 11.1 (8.4–13.8) 71.5 (67.6–75.3) 16.9 (13.9–20.2) 0.2 (0.0–0.6) 0.0 (0.0–0.2)
  Obese Class I 0.0 (0.0–0.2) 0.8 (0.0–1.9) 19.5 (14.5–24.7) 68.1 (62.0–74.1) 10.7 (6.8–14.9) 0.8 (0.0–1.9)
  Obese Class II 0.1 (0.0–0.7) 1.2 (0.0–3.7) 2.5 (0.1–5.8) 23.4 (14.3–33.5) 59.1 (47.8–70.0) 13.6 (6.3–21.2)
  Obese Class III 0.3 (0.0–1.6) 0.3 (0.0–1.7) 0.3 (0.0–1.7) 6.1 (0.4–14.1) 31.0 (15.7–46.6) 62.0 (45.3–77.5)
65 – 74 Underweight 73.2 (58.8–87.6) 25.5 (12.2–40.7) 0.3 (0.0–1.6) 0.3 (0.0–1.6) 0.3 (0.0–1.6) 0.5 (0.0–2.7)
  Normal Weight 3.8 (2.2–5.4) 82.1 (78.9–85.2) 13.3 (10.6–16.1) 0.6 (0.1–1.3) 0.2 (0.0–0.5) 0.0 (0.0–0.2)
  Overweight 0.4 (0.0–0.9) 16.7 (13.8–19.5) 73.1 (69.5–76.6) 9.5 (7.1–11.8) 0.3 (0.0–0.7) 0.0 (0.0–0.1)
  Obese Class I 0.0 (0.0–0.2) 1.2 (0.2–2.3) 21.8 (17.3–26.6) 69.6 (64.5–74.7) 6.7 (4.1–9.6) 0.6 (0.0–1.4)
  Obese Class II 0.1 (0.0–0.6) 0.1 (0.0–0.5) 7.2 (2.5–12.1) 26.4 (16.8–35.5) 61.9 (51.0–71.6) 4.3 (0.7–8.8)
  Obese Class III 0.3 (0.0–1.8) 0.3 (0.0–2.0) 0.3 (0.0–1.9) 0.5 (0.0–2.9) 30.6 (14.3–47.4) 68.0 (50.5–83.9)
75 + Underweight 76.4 (55.5–94.3) 21.6 (2.9–40.8) 0.4 (0.0–2.6) 0.4 (0.0–2.2) 0.4 (0.0–2.6) 0.8 (0.0–4.2)
  Normal Weight 8.2 (5.1–11.7) 82.0 (77.4–86.5) 9.6 (6.4–13.1) 0.1 (0.0–0.5) 0.0 (0.0–0.2) 0.1 (0.0–0.3)
  Overweight 0.1 (0.0–0.4) 29.9 (24.3–35.2) 63.1 (57.2–68.8) 6.8 (4.1–9.7) 0.0 (0.0–0.2) 0.1 (0.0–0.3)
  Obese Class I 0.1 (0.0–0.4) 2.1 (0.1–4.8) 41.1 (31.7–49.8) 53.8 (44.6–63.0) 2.7 (0.4–5.7) 0.1 (0.0–0.7)
  Obese Class II 0.3 (0.0–1.9) 0.3 (0.0–1.7) 7.1 (0.4–16.4) 39.7 (21.9–59.1) 50.8 (32.2–70.1) 1.8 (0.0–8.0)
  Obese Class III 2.1 (0.0–12.2) 2.2 (0.0–13.2) 2.1 (0.0–12.7) 3.4 (0.0–21.3) 27.0 (0.0–70.9) 63.3 (20.2–100.0)
  1. CI = Confidence Interval
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