Table 3.

Percentage for number of roots in the mandibular first premolar for the different studies compared to the current study.

Reference	Method of study	Population	Number of roots
			One (%)	Two (%)	Three (%)	Four (%)
Trope et al. [4]	In vivo radiographs	American
		African	83.8	16.2	0	0
		Caucasian	94.5	5.5	0	0
Geider et al. [16]	Tooth sectioning and radiography	France	90.6	6.4	2.4	0.6
Çaliskan et al. [17]	Tooth clearing	Turkey	100.0	0	0	0
Zaatar et al. [15]	In vivo; postoperative radiographs	Kuwait	85.0	15	0	0
Sert and Bayirli [7]	Tooth clearing	Turkey	100.0	0	0	0
Iyer et al. [20]	In vivo; digital radiography	India	95.9	3.9	0.2	0
Cleghorn et al. [33]	Review article	Global	97.9	1.8	0.2	0.1
Awawdeh and Al-Qudah [24]	Tooth clearing	Jordan	97	3	0	0
Peiris [19]	Tooth clearing	Seri Lanka	98.8	1.2	0	0
		Japan	100	0	0	0
Jain and Bahuguna [32]	Tooth clearing	India	97.11	2.89	0	0
Current study	Tooth clearing	Egypt	96.8	3.2	0	0