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Table 1

Risk factors*.

Risk factor Patients (%)
Bronchial asthma 1 (2.5)
Chronic kidney disease (CKD) 12 (30.7)
Diabetes mellitus 5 (12.8)
Chronic hepatic impairment 11 (28.2)
Hypertension 5 (12.8)
Ischemic heart disease 1 (2.5)
Previous spine surgery 1 (2.5)
None 14 (35.9)
*

Patients may have more than one risk factor.