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Table 1 Previous studies presenting estimates of SDC and MIC a

From: The influence of study population and definition of improvement on the smallest detectable change and the minimal important change of the neck disability index

Study NP/CRa Populationa N NDI (T0) GPE Stable SDC MIC (sens/spec)
Cleland[9]b NP acute + chronic 137 32.2-35.7 15 pt -3 to +3 11.6* 9.5 (0.83/0.72)
Young[14]b CR average 4 weeks 165 24-25 13/15 pt -1 to +1 17.9* 8,5 (0.62/0.79)
Young[13] NP unclear 91 15.8-18.0 15 pt -2 to +2 12.1* 7.5 (n.r.)
Cleland[9]b NP acute + chronic 137 32.2-35.7 15 pt -2 to +2 8.1 7.0
Cleland[8] NP + CR average 2 weeks 38 21.9-20.7 15 pt -3 to +3 12.0 7.0 (0.52/0.59)
Young[14]b CR average 4 weeks 165 24-25 13/15 pt -2 to +2 15.9* 6.5 (0.57/0.67)
Jorritsma[15] NP chronic 76 21 7 pt -1 to +1 8.4 3.5
Pool[10] NP acute + chronic 183 14.5 6 pt 2 to 4 10.5 3.5 (0.90/0.70)
Vos[12]c NP acute 187 13.0-16.0 7 pt 3 to 5 7.62 n.r.a
Trouli[11]d NP acute + chronic 65 n.r. 15 pt -3 to +3 3.03 n.r.a
  1. Notes:
  2. aNP = neck pain, CR = cervical radiculopathy, n.r. = not reported, chronic neck pain > 6 weeks;
  3. bCleland 2008 and Young 2010 reported two different analyses, these analyses are represented in the table as separate studies;
  4. cVos et. al. reported a different SDC of 1.66 in a published paper[16]. The correct SDC reported in his dissertation[12] is presented;
  5. dTrouli et. al. reported a SDC of 1.78 but this value does not agree with the Bland & Altman plot presented. We present a SDC estimated from the Bland & Altman plot;
  6. *reported SDC(90) was changed to SDC(95) (SDC(95) = 1.96 × SDC(90)/ 1.65);