Table 2.

Distribution of attachments stratified for group of teeth

	Absence of attachments		Conventional attachments		Optimized attachments
	Proportion	95% confidence interval	Proportion	95% confidence interval	Proportion	95% confidence interval
Maxilla
Central incisors	0.66	0.63 to 0.69	0.01	0.003 to 0.01	0.33	0.30 to 0.36
Lateral incisors	0.29	0.26 to 0.32	0.10	0.08 to 0.12	0.61	0.58 to 0.64
Canines	0.13	0.11 to 0.15	0.16	0.14 to 0.19	0.71	0.68 to 0.74
Premolars	0.18	0.16 to 0.20	0.15	0.14 to 0.17	0.67	0.64 to 0.69
First molars	0.25	0.23 to 0.28	0.55	0.52 to 0.58	0.19	0.17 to 0.22
Second molars	0.60	0.57 to 0.63	0.32	0.29 to 0.35	0.08	0.06 to 0.10
Mandible
Incisors	0.83	0.81 to 0.85	0.04	0.03 to 0.05	0.13	0.12 to 0.15
Canines	0.25	0.22 to 0.28	0.05	0.04 to 0.07	0.70	0.67 to 0.73
Premolars	0.21	0.19 to 0.23	0.09	0.07 to 0.10	0.70	0.68 to 0.72
First molars	0.42	0.39 to 0.45	0.49	0.46 to 0.52	0.09	0.08 to 0.12
Second molars	0.63	0.60 to 0.66	0.27	0.24 to 0.29	0.10	0.08 to 0.12