. 2022 Nov 12;8(11):e11567. doi: 10.1016/j.heliyon.2022.e11567

Table 3.

The X-ray cone alignment time (s, mean ± standard deviation) at three horizontal angulations with the aids of an extension cone paralleling (XCP) holder or an angulation-adjustable holder.

Horizontal angulation	X-ray cone alignment time		p-value
Horizontal angulation	XCP holder	Angulation-adjustable holder	p-value
Right angle	24.59 ± 07.72^a,∗	27.61 ± 09.09^a	0.109
20° mesial	64.22 ± 46.01^b,∗∗	29.59 ± 12.61^a	0.000
20° distal	122.59 ± 90.36^b,∗∗∗	32.76 ± 22.62^a	0.000
p-value	0.000	0.336

Note: Different superscripted letters and asterisks indicate significant intrarow and intracolumn differences by an independent t test and a one-way ANOVA, respectively, at p < 0.05.