Table 1.

PICOS Search

P (patient, problem, population)	Patient underwent orthopaedic surgeries
I (intervention)	Evaluation of effect of laminar airflow ventilation system in the prevention of surgical site infections (SSIs) in operating room
C (comparison, control or comparator)	Comparison of operating rooms with or without laminar air flow
O [outcome (s)]	laminar airflow ventilation system is not effective in the prevention of surgical site infections (SSIs) in operating room
S (study type)	Randomized controlled trials, cohort study, comparative study, prospective study, retrospective study