|
Parameter
|
ODI baseline
|
ODI 1-year follow up
|
Δ ODI (follow up-baseline)
|
|---|
|
Estimate
|
SE
|
p-value
|
Estimate
|
SE
|
p-value
|
Estimate
|
SE
|
p-value
|
|---|
|
Intercept
|
42.68
|
0.54
|
<.0001
|
22.140
|
0.74
|
<.0001
|
20.61
|
1.21
|
<.0001
|
|
Time
|
−0.008
|
0.01
|
0.451
|
0.004
|
0.01
|
0.776
|
−0.02
|
0.02
|
0.372
|
|
VBRP
|
−0.069
|
1.14
|
0.952
|
0.250
|
1.57
|
0.875
|
−1.41
|
2.54
|
0.579
|
|
Time after
|
−0.066
|
0.06
|
0.309
|
0.030
|
0.09
|
0.749
|
−0.03
|
0.14
|
0.819
|
|
July
|
5.460
|
0.94
|
<.0001
|
−6.990
|
1.28
|
<.0001
|
14.57
|
2.09
|
<.0001
|
- Note: SE Standard Error, Intercept, The ODI level in January 2006; Time, number of months from January 2006; VBRP, indicates the introduction of the STHLM-VBRP at the end of 2013; which is 92 months after January 2006 (Time = 92); Time after, number of months after the introduction of VBRP (Time-91); July, indication of the month of July
- Parameter estimates from the segmented regression analysis predicting the mean monthly Oswestry disability index (ODI) level among surgically treated patients before and after the introduction of the STHLM-VBRP, 2006–2015. The introduction of the reimbursement program had no effect on level (VBRP) nor trend (Time after) of ODI
