Korean Journal of Clinical Pharmacy

Table. 2. Table 2

Risk of bias

Study name	risk of data collection bias	risk of extrapolation bias	risk of under- detection/ over- detection bias by parallel import/export	risk of ambulatory/ hospital mix bias	risk of under detection bias by OTC sales	risk of under- detection bias (use of) selected drug list	risk of terminology and measurement assignment bias	other potential bias detected
JH Heo et al.18)	Low	High	Low	High	Medium	Medium	High	Low

SO Lee et al.19)	Low	Low	Low	High	Low	Medium	Low	Low

MH Yi et al.20)	Low	High	Medium	Low	Medium	Medium	High	Medium

SO Kim et al.21)	Low	High	High	High	Medium	Medium	High	High

DS Kim et al.22)	Low	Low	Low	Low	Medium	Medium	High	Low

JY Shin et al.23)	Low	Low	Low	High	Low	Low	Low	Low

BJ Park et al.24)	Low	Low	Low	High	Low	Low	Medium	Low

JH Yang et al.25)	Low	Low	Low	High	Medium	Medium	Medium	Medium

IM Song et al.26)	Low	Low	Low	High	Medium	Low	Medium	Medium

HN Shin et al.27)	Low	Low	Low	High	Low	Low	Low	Low

SY Song et al.28)	Low	Low	Low	Low	Low	Low	Medium	Low