Table 1. Excluded literature and reasons for exclusion.

Serial number	Author	Date of publication	Reason for exclusion
1	Denkel LA et al. (9)	2016	No group comparison data
2	Al-Hosni M et al. (10)	2012	No group comparison data
3	Qiao LX et al. (11)	2017	Not enough data
4	Spreckels JE (12)	2021	Data cannot be transformed