Skip to main content

Table 3 NDI scores at baseline and after 6 months for different levels of the GPE (N = 99)

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

GPE pain NDI:T0, mean (sd) NDI:T1, mean (sd) NDI:T1-T0, mean (sd)
1 Completely recovered (N = 14) 22.1 (3.1) 11.3 (1.9) -10.9 (3.6)
2 Much improved (N = 41) 24.0 (6.8) 16.5 (3.3) -7.5 (6.0)
3 Slightly improved (N = 17) 25.1 (5.4) 22.0 (4.8) -3.1 (4.0)
4 Unchanged (N = 23) 25.6 (7.1) 24.6 (9.1) -1.0 (5.9)
5 Slightly worse (N = 2) 28.0 (7.1) 32.0 (1.5) 4.0 (8.5)
6 Much worse (N = 2) 27.0 (0.0) 27.0 (9.9) 0.0 (9.9)
GPE 1-3 (N = 72) 23.9 (6.0) 16.8 (5.0) -7.1 (5.8)
GPE 4 (N = 23) 25.6 (7.1) 24.6 (9.1) -1.0 (5.9)
GPE 5-6 (N = 4) 27.5 (4.1) 29.5 (6.5) 2.0 (7.8)
GPE 1-2 (N = 55) 23.5 (6.1) 15.6 (3.8) -8.4 (5.7)
GPE 3-5 (N = 42) 25.5 (6.3) 23.9 (7.6) -1.6 (5.4)
GPE 6 (N = 2) 27.0 (0.0) 27.0 (9.9) 0.0 (9.9)
GPE function NDI:T 0 , mean (sd) NDI:T 1 , mean (sd) NDI:T 1 -T 0 , mean (sd)
1. Completely recovered (N = 19) 22.7 (6.5) 12.3 (2.6) -10.5 (6.9)
2. Much improved (N = 34) 24.3 (6.2) 16.9 (3.4) -7.5 (4.7)
3. Slightly improved (N = 17) 25.0 (5.5) 22.1 (4.5) -3.0 (3.4)
4. Unchanged (N = 26) 25.0 (6.8) 23.5 (9.1) -1.6 (5.9)
5. Slightly worse (N = 2) 25.0 (2.8) 33.5 (0.7) 8.5 (2.1)
6. Much worse (N = 1) 32.0 32.0  
GPE 1-3 (N = 70) 24.1 (6.0) 16.9 (4.9) -7.2 (5.7)
GPE 4 (N = 26) 25.0 (6.8) 23.5 (9.1) -1.6 (5.9)
GPE 5-6 (N = 3) 27.3 (4.5) 33.0 (1.0) 5.7 (5.1)
GPE 1-2 (N = 53) 23.8 (6.3) 15.2 (3.8) -8.6 (5.7)
GPE 3-5 (N = 45) 25.0 (6.1) 23.4 (7.8) -1.6 (5.4)
GPE 6 (N = 1) 32.0 32.0 0.0