Table 4.

Student t-test comparison of mixed dentition noncrowded and crowded arches

	Mixed upper noncrowded			Mixed upper crowded			Comparison
	Sample size	Average	Standard deviation	Sample size	Average	Standard deviation	t-value	p-value	Inference
Intermolar width	111	30.9033	2.2322	39	29.4231	2.2359	3.5581	0.0005	Significant difference
Intercanine width	111	24.9892	2.0978	39	20.5974	3.0115	0.7509	0. 007	Significant difference
Arch length	111	28.7351	2.0396	39	29.1769	2.0447	1.1615	0.2473	No significant difference
Available arch length	111	79.5405	5.1958	39	79.8205	4.6503	0.3135	0.7544	No significant difference
Sum of incisors	111	28.8477	2.1810	39	30.6641	2.6520	3.8447	0.0002	Significant difference
	Sample size	Average	Standard deviation	Sample size	Average	Standard deviation	t-statistic	p-value	Inference
Intermolar width	80	28.0938	2.1804	70	27.5314	2.0063	1.6444	0.1022	No significant difference
Intercanine width	80	19.5650	1.7353	70	16.4371	1.9941	0.4160	0.0005	Significant difference
Arch length	80	24.8100	1.5799	70	25.1086	1.7303	1.0978	0.2741	No significant difference
Available arch length	80	71.8125	3.8651	70	71.8429	4.9917	0.0412	0.9672	No significant difference
Sum of incisors	80	21.0288	1.6212	70	22.6300	1.7711	5.7456	0.0000	Significant difference