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Table 2 Frequency of one-phase and two-phase treatments and re-planned cases in all evaluated intervals (proportion test)

From: Frequency evaluation of different extraction protocols in orthodontic treatment during 35 years

Interval N One-phase Two-phase Not replanned Re-planned
N % N % N % N %
1 105 104 99.05 1 0.95A 104 99.05 1 0.95BC
(1973 to 1977)
2 146 145 99.32 1 0.68A 143 97.94 3 2.06BC
(1978 to 1982)
3 314 309 98.73 5 1.27A 305 97.13 9 2.87BC
(1983 to 1987)
4 666 636 98.05 30 1.95AB 653 98.05 13 1.95BC
(1988 to 1992)
5 1262 1172 95.17 90 4.83BC 1226 97.15 36 2.85BC
(1993 to 1997)
6 612 521 92.81 91 7.19D 587 95.91 25 4.09AB
(1998 to 2002)
7 308 296 93.18 12 6.82AB 306 99.35 2 0.65CD
(2003 to 2007)
Total 3,413 3,183 93.26 230 6.74 3324 97.39 89 2.61
   χ 101.272    12.726
   P 0.0000*    0.0475*
  1. Different letters in two-phase treatment or in re-planned cases represent statistically significant differences. *Statistically significant at P < 0.05.