Table 1. Validity and reliability of measurements made on intraoral photographs of the dental arches compared to those made on plaster models (examiner A).

* P < 0.05, ** P < 0.01, and *** P < 0.001. ICC: intraclass correlation coefficient; SD: standard deviation; TSALD: tooth size-arch length discrepancy; LII: Little's Irregularity Index; BBL: basal bone length; STS: sum of teeth sizes.

Variable	ICC	Mean difference	SD	P-value	95% confidence interval
STS	0.98	−0.45	0.91	0.011*	−0.70	−0.19
BBL	0.98	−0.39	0.40	0.002***	−0.50	−0.27
TSALD value	0.90	−0.10	0.95	0.652	−0.32	−0.20
LII	099	−0.16	0.35	0.002**	−0.25	−0.06
Partial Bolton	0.98	−0.24	0.51	0.002**	−0.46	−0.03
Overall Bolton	0.97	−0.40	0.56	0.691	−0.28	0.19