Risk factors of pilonidal sinus disease in preparatory school students; a case control study

BACKGROUND: Pilonidal sinus disease (PNS) is a disorder of the young population. The aim of this study is to analyze the risk factors associated with development of PNS in the secondary school students. METHODS: This case control study enrolled 189 participants, (Control group: 95 cases, case group: 94 cases). The inclusion criterion for the trial group was those secondary school students with PNS and age ranged between 16 and 20 years without the known risk factors of PNS. RESULT: About 80 (42.3%) patients were male and 109 (57.7%) were female. Each group included 95 patients. There was no significant difference in both groups regarding basic features. Among the control group 36 (37.9%) participants were used to study while sitting on a hard place whereas among the case group 62 (66%) cases were used to study while sitting on a hard place, the difference was statistically significant (<0.001). CONCLUSION: Sitting on the hard places could be regarded as a risk factor of developing PNS among secondary school students.