Table 2 Characteristics of the study populations

Number of inpatients

  Total (%)

6,202,313 (100.0)

16,230,407 (100.0)

7,125,028 (100.0)

  Male (%)

2,677,383 (43.2)

7,505,172 (46.2)

2,957,623 (41.5)

  Emergency (%)

3,361,405 (54.2)

5,702,142 (35.1)

3,252,330 (45.7)

  Operation (%)

2,836,784 (45.7)

6,563,549 (40.4)

3,890,723 (54.6)

  Died (%)

208,596 (3.4)

388,682 (2.4)

143,279 (2.0)

Age in years

  Mean (std. dev.)

47.1 (28.27)

52.8 (25.58)

48.1 (27.90)

  Median (Q1-Q3)

49 (25–72)

59 (35–73)

52 (27–72)

Length of stay in days

  Mean (std. dev.)

6.4 (12.34)

7.5 (8.79)

4.5 (6.08)

  Median (Q1-Q3)

3 (1–6)

5 (X^†-9)

3 (2–5)