Table 1: Percentage of frequency of risk factors.

Associated factors

Frequency

Percentage

Valid percentage

Accumulated percentage

Hypovolemia

9

12.3

12.3

12.3

Sepsis

3

4.1

4.1

16.4

Trauma

11

15.1

15.1

31.5

Urinary tract obstruction

30

41.1

41.1

72.6

Suspected undiagnosed rheumatological disease

1

1.4

1.4

74.0

OTROS

19

26.0

26.0

100.0

Total

73

100.0

100.0