Table 2.

Characteristics of the selected studies.

Study	Sample			Location		Encouragement
	n	Age ranged (years)	BMI (kg/m2)	Flat/straight corridor. Hard surface	Corridor length (m)	Standardized phrases	ATS guidelines	Same technician
Li et al.[17]	1445	7 to 16	18.4 ±3.4	Yes	30	Yes	Yes	Yes
Kanburoglu et al.[24]	949	11 to 18	22.47±2.7	Yes	30	Yes	Yes	Yes
Lammers et al.[20]	328	4 to 11	16.9 ±2.6	Yes	30 to 50	Yes	Yes	Yes
Priesnitz et al.[22]	188	6 to 12	18.5±3	Yes	30	Yes	Yes
Saad et al.[18]	200	6 to 16		Yes	40	Yes	Yes	Yes
Klepper & Muir[14]	100	7 to 11	18.5±6.5	Yes	15 to 25	Yes	Yes (but It was not said that they could stop and rest)	Not informed
Tonklang et al.[16]	739	9 to 12	Not informed	Yes	30	Yes	Yes	No
D’Silva et al.[25]	400	7 to 12	14.7±0.7	Yes	30	Yes	Yes	Yes
Goemans et al.[19]	442	5 to 12	Not informed	Yes	25	Yes	No	No
Ulrich et al.[21]	496	5 to 17	17.9±3.3	Yes	30	No	Yes	Not informed
Gatica et al.[23]	192	6 to 14	19.49±1.83	Yes	30	Yes	Yes	Not informed
Rahman & Alnegimshi[15]	136	6 to 11	16.65±1.75	Yes	30	Yes	Yes	Yes