Table 4.
Estimates of Numbers of Chiropractic Visits, Cost per Visit, and Cost per 1-Point Reduction in Different Measures of Pain (Revealed WTP)
| Chronic Low-Back Pain | Chronic Neck Pain | |||||
|---|---|---|---|---|---|---|
| Variables | Full Sample1 |
Revealed WTP Sample2 |
Pain Reduction Sample3 |
Full Sample1 |
Revealed WTP Sample2 |
Pain Reduction Sample3 |
| N | 865 | 762 | 488 | 718 | 632 | 392 |
| # Chiropractic visits for 6 months pre-baseline | 12.23 (15.3) |
12.56 (14.8) |
12.82 (16.5) |
12.09 (13.3) |
12.22 (13.3) |
12.38 (15.1) |
| # Chiropractic visits over 3 months | --- | 6.64 (5.7) |
6.50 (5.7) |
--- | 6.90 (5.8) |
6.69 (5.7) |
| Cost per visit (overall) | $43.43 (31.3) |
$43.71 (31.5) |
$43.98 (32.4) |
$45.24 (31.2) |
$45.06 (31.0) |
$43.8 (30.1) |
| Cost per visit (with insurance) | $32.95 (27.0) |
$33.36 (27.9) |
$34.57 (29.5) |
$36.08 (29.8) |
$36.07 (29.8) |
$35.14 (27.6) |
| Cost per visit (without insurance) | $66.53 (27.6) |
$66.38 (26.8) |
$65.59 (28.1) |
$63.84 (25.2) |
$63.92 (24.1) |
$63.19 (26.0) |
| Average cost of chiropractic care over 3 months | --- | $307.85 (458.8) |
$311.06 (491.7) |
--- | $314.1 (391.8) |
$304.01 (410.8) |
| Change in actual pain over 3 months | --- | --- | −0.76 (0.5) |
--- | --- | −0.77 (0.5) |
| Change in projected pain over 3 months | --- | --- | −0.97 (0.6) |
--- | --- | −0.96 (0.6) |
| Expected pain reduction with care (projected pain minus actual pain at baseline) | 3.10 (2.0)* |
3.15 (1.9)* |
3.02 (1.9) |
2.98 (1.9) |
3.02 (1.8) |
2.91 (1.7) |
| Cost per 1-point reduction in actual pain | --- | --- | $784.21 (1,522.3) |
--- | --- | $674.87 (1,100.3) |
| Cost per 1-point reduction in projected pain | --- | --- | $697.32 (1,486.9) |
--- | --- | $760.09 (1,584.6) |
| Average cost of a 1-point reduction in expected pain reduction with care | --- | $35.81 (60.2) |
$36.67 (63.1) |
--- | $41.41 (55.1) |
$42.82 (58.6) |
WTP = Willingness to pay for pain reduction
The Full Sample includes all patients who answered the WTP questions. Footnotes in this column relate to the statistical significance of the differences between the Full and Revealed WTP Samples.
The Revealed WTP Sample includes those from the Full Sample who had chiropractic visits after baseline. Footnotes in this column relate to the statistical significance of the differences between the Revealed WTP and Pain Reduction Samples.
The Pain Reduction Sample includes all those in the Revealed WTP Sample who had a reduction over 3 months in both actual pain and in reports of what their pain would have been without chiropractic care. Footnotes in this column relate to the statistical significance of the differences between the Full and Pain Reduction Samples.
Differences are statistically significant at p<.05.
Differences are statistically significant at p<.01.
Differences are statistically significant at p<.001.