Table 3.

Ratio of anterior to posterior width (sagittal plane). Ratio a/p of the width on the dental, gingival-alveolar and skeletal-basal plane. ΔT2-T1 (Diff.) was determined from the ratio of the differences of the respective widths in the anterior and posterior area between the times T1 and T2. $\frac{\mathrm{Width}\mathrm{a}\mathrm{T}2-\mathrm{Width}\mathrm{a}\mathrm{T}1}{\mathrm{Width}\mathrm{p}\mathrm{T}2-\mathrm{Width}\mathrm{p}\mathrm{T}1}$. ΔT2-T1 (Diff.) < 1 indicates a greater increase in the posterior region, ΔT2-T1 (Diff.) = 1 shows an equal change anteriorly and posteriorly, ΔT2-T1 (Diff.) > 1 indicates a greater increase in the anterior region. M Mean, SD standard deviation, a anterior (1st deciduous or premolar), p posterior (1st molar), GM gingival margin

	All patients					PG 1					PG 2					PG 1 vs. PG 2
	T1	T2	ΔT2-T1	ΔT2-T1 (Diff.)		T1	T2	ΔT2-T1	ΔT2-T1 (Diff.)		T1	T2	ΔT2-T1	ΔT2-T1 (Diff.)
	M ± SD	M ± SD	M ± SD	M ± SD	p(intra)	M ± SD	M ± SD	M ± SD	M ± SD	p(intra)	M ± SD	M ± SD	M ± SD	M ± SD	p(intra)	p(inter)
Ratio a/p dental	0.77 ± 0.04	0.79 ± 0.05	0.02 ± 0.04	1.26 ± 4.23	< 0.001	0.76 ± 0.03	0.77 ± 0.04	0.02 ± 0.03	0.70 ± 1.70	< 0.001	0.78 ± 0.04	0.81 ± 0.05	0.03 ± 0.04	1.78 ± 5.62	< 0.001	0.020
Ratio a/p GM gingival-alveolar	0.77 ± 0.05	0.80 ± 0.06	0.03 ± 0.05	1.54 ± 1.83	< 0.001	0.77 ± 0.05	0.79 ± 0.05	0.01 ± 0.04	0.97 ± 0.45	0.017	0.77 ± 0.06	0.82 ± 0.07	0.05 ± 0.05	2.11 ± 2.42	0.017	< 0.001
Ratio a/p -6 mm skeletal-basal	0.64 ± 0.13	0.69 ± 0.13	0.05 ± 0.13	0.84 ± 3.24	< 0.001	0.69 ± 0.11	0.72 ± 0.13	0.03 ± 0.11	0.57 ± 1.86	0.052	0.59 ± 0.12	0.65 ± 0.11	0.06 ± 0.08	1.12 ± 4.19	< 0.001	0.062