The risk factors were history of PDPH (OR = 4.5; 95% CI: 1.8 - 11.09), sinusitis (OR = 2.65; 95% CI: 1.10 - 6.36), local anesthesia (Marcain spinal 0.5% heavy) (OR = 6.66; 95% CI: 2.25 - 19.11), perioperative hypotension (OR = 2.42; 95% CI: 1.25 - 4.70).