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Table 1 Characteristics on 1756 cases of ankle fracture. Number and proportion of the different classes as well as proportion of elderly patients, women and low energy trauma. 95% CI was calculated using Wilson method

From: Epidemiology of Adult Ankle Fractures: 1756 cases identified in Norrbotten County during 2009–2013 and classified according to AO/OTA

AO class Number, n (%) >  65 years Women Low energy
A 347 (19.8) 35.2 (30.3–40.3) 60.2 (55.0–65.2) 58.8 (53.6–63.9)
 A1 243 (13.8) 36.6 (30.8–42.9) 67.9 (61.8–73.5) 64.9 (58.7–70.6)
  A12 136 (7.7) 36.8 (29.1–45.1) 66.9 (58.6–74.2) 62.5 (54.1–70.2)
  A13 107 (6.1) 36.4 (27.9–45.9) 69.2 (59.9–77.1) 67.9 (58.5–76.1)
 A2 91 (5.2) 31.9 (23.2–42.0) 40.0 (30.5–50.3) 43.3 (33.6–53.6)
  A21 71 (4.0) 25.4 (16.7–36.6) 31.4 (21.8–43.0) 37.1 (26.8–48.9)
  A22 11 (0.6) 63.6 (35.4–84.8) 72.7 (43.4–90.3) 54.5 (28.0–78.7)
  A23 9 (0.5) 44.4 (18.9–73.3) 66.7 (35.4–87.9) 77.8 (45.3–93.7)
 A3 13 (0.7) 30.8 (12.7–57.6) 61.5 (35.5–82.3) 53.8 (29.1–76.8)
  A31 7 (0.4) 14.3 (2.6–51.3) 57.1 (25.1–84.2) 57.1 (25.1–84.2)
  A32 2 (0.1) 50.0 (9.5–90.6) 50.0 (9.5–90.6) 100.0 (34.2–100.0)
  A33 4 (0.2) 50.0 (15.0–85.0) 75.0 (30.7–95.4) 25.0 (4.6–69.9)
B 1162 (66.2) 36.7 (33.9–39.5) 60.1 (57.2–62.9) 72.0 (69.4–74.5)
 B1 649 (37.0) 36.5 (32.9–40.3) 53.0 (49.2–56.8) 71.6 (68.1–75.0)
  B11 484 (27.6) 34.7 (30.6–39.1) 53.9 (49.5–58.3) 71.1 (66.9–74.9)
  B12 145 (8.3) 42.8 (35.0–50.9) 49.0 (41.0–57.0) 73.8 (66.1–80.3)
  B13 20 (1.1) 35.0 (18.1–56.7) 60.0 (38.7–78.1) 70.0 (48.1–85.5)
 B2 221 (12.6) 35.7 (29.7–42.3) 59.7 (53.2–66.0) 72.4 (66.1–77.9)
  B21 96 (5.5) 26.0 (18.3–35.6) 46.9 (37.2–56.8) 74.0 (64.4–81.7)
  B22 111 (6.3) 45.0 (36.1–54.3) 69.4 (60.3–77.2) 72.1 (63.1–79.6)
  B23 14 (0.8) 28.6 (11.7–54.7) 71.4 (45.3–88.3) 64.3 (38.8–83.7)
 B3 292 (16.6) 37.7 (32.3–43.3) 76.0 (70.8–82.4) 72.6 (67.2–77.4)
  B31 100 (5.7) 32.0 (23.7–41.7) 65.0 (55.3–73.6) 72.0 (62.5–79.9)
  B32 156 (8.9) 42.3 (34.8–50.2) 80.8 (73.9–86.2) 71.2 (63.6–77.7)
  B33 36 (2.1) 33.3 (25.6–55.3) 86.1 (71.3–93.9) 80.6 (65.0–90.3)
C 189 (10.6) 25.4 (19.6–32.1) 48.7 (41.7–55.8) 62.4 (55.4–69.0)
 C1 95 (5.4) 29.5 (21.3–39.3) 56.8 (46.8–66.3) 64.2 (54.2–73.1)
  C11 61 (3.5) 29.5 (19.6–41,9) 54.1 (41.7–66.0) 70.5 (58.1–80.4)
  C12 5 (0.3) 60.0 (23.1–88.2) 60.0 (23.1–88.2) 60.0 (23.1–88.2)
  C13 29 (1.7) 24.1 (12.2–42.1) 62.1 (44.0–77.3) 51.7 (34.4–68.6)
 C2 59 (3.4) 18.6 (10.7–30.4) 47.5 (35.3–60.0) 59.3 (46.6–70.9)
  C21 22 (1.3) 9.1 (2.5–27.8) 31.8 (16.4–52.7) 59.1 (38.7–76.7)
  C22 8 (0.5) 37.5 (13.7–69.4) 50.0 (21.5–78.5) 37.5 (13.7–69.4)
  C23 29 (1.7) 20.7 (9.8–38.4) 58.6 (40.7–74.5) 65.5 (47.6–80.1)
 C3 35 (2.0) 25.7 (14.1–42.1) 28.6 (16.3–45.1) 62.9 (46.3–76.8)
  C31 18 (1.0) 27.8 (12.5–50.9) 22.2 (8.5–43.3) 61.1 (38.6–79.7)
  C32 3 (0.2) 33.3 (6.15–79.2) 0.0 (0.0–56.2) 0.0 (0.0–56.2)
  C33 14 (0.8) 21.4 (7.6–47.6) 42.9 (21.4–67.4) 78.6 (52.4–92.4)
Unclassified 58 (3.3) 20.7 (12.3–32.8) 43.6 (31.4–56.7) 67.3 (53.8–78.5)
Total 1756 (100.0) 34.6 (32.4–36.8) 58.4 (56.1–60.7) 68.2 (66.0–70.4)