Table 5.
Predicted mean costs and incremental effects of predictors
| Patient type | Group | Predicted Mean costs ($) | Incremental cost per PFD compared to SMT 0 ($) | Incremental cost per DFD compared to SMT 0 ($) | Incremental Cost($) of Dose change to | Incremental Costs ($) due the following: | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SMT 6 | SMT 12 | SMT 18 | Smoking | 14-year (1 SD) increase in age | 22-point (1 SD) increase in baseline disability score | $30 (1 SD) increase in treatment costs in the 14 days preceding enrollment | $600 (1 SD) increase in treatment and lost productivity costs in the 14 days preceding enrollment | |||||
| Annual cost of treatment | ||||||||||||
| Profile M* | SMT 0 | 596 | N.A. | N.A. | 317 | 123 | 345 | 123 | 34 | 192 | 119 | N.A. |
| Profile M* | SMT 6 | 914 | 19 | 25 | N.A. | −194 | 28 | 161 | 44 | 251 | 156 | N.A. |
| Profile M* | SMT 12 | 720 | 5 | 6 | N.A. | 222 | 107 | 29 | 167 | 104 | N.A. | |
| Profile M* | SMT 18 | 941 | 19 | 28 | N.A. | 110 | 30 | 173 | 107 | N.A. | ||
| Profile L† | SMT 0 | 61 | N.A. | N.A. | 154 | 195 | 401 | 12 | 3 | 20 | 47 | N.A. |
| Profile L† | SMT 6 | 215 | 9 | 12 | N.A. | 41 | 246 | 16 | 4 | 25 | 61 | N.A. |
| Profile L† | SMT 12 | 255 | 9 | 10 | N.A. | 206 | 11 | 3 | 17 | 41 | N.A. | |
| Profile L† | SMT 18 | 461 | 22 | 33 | N.A. | 11 | 3 | 18 | 42 | N.A. | ||
| Profile H‡ | SMT 0 | 3,551 | N.A. | N.A. | 1,217 | −271 | 39 | 733 | 202 | 1,147 | 487 | N.A. |
| Profile H‡ | SMT 6 | 4,768 | 72 | 95 | N.A. | −1,488 | −1,178 | 956 | 263 | 1,496 | 635 | N.A. |
| Profile H‡ | SMT 12 | 3,280 | −12 | −14 | N.A. | 310 | 635 | 175 | 994 | 422 | N.A. | |
| Profile H‡ | SMT 18 | 3,590 | 2 | 3 | N.A. | 657 | 181 | 1,028 | 436 | N.A. | ||
| Annual cost of treatment and lost productivity | ||||||||||||
| Profile M* | SMT 0 | 3,492 | N.A. | N.A. | 734 | 94 | 476 | 536 | 764 | 1,601 | N.A. | 825 |
| Profile M* | SMT 6 | 4,226 | 44 | 57 | N.A. | −640 | −258 | 627 | 894 | 1,875 | N.A. | 966 |
| Profile M* | SMT 12 | 3,586 | 4 | 5 | N.A. | 381 | 519 | 740 | 1,551 | N.A. | 799 | |
| Profile M* | SMT 18 | 3,968 | 26 | 39 | N.A. | 546 | 779 | 1,632 | N.A. | 841 | ||
| Profile L† | SMT 0 | 1,637 | N.A. | N.A. | 416 | 152 | 439 | 251 | 358 | 750 | N.A. | 387 |
| Profile L† | SMT 6 | 2,053 | 25 | 33 | N.A. | −264 | 23 | 294 | 419 | 879 | N.A. | 453 |
| Profile L† | SMT 12 | 1,789 | 7 | 8 | N.A. | 287 | 243 | 347 | 727 | N.A. | 375 | |
| Profile L† | SMT 18 | 2,076 | 24 | 36 | N.A. | 256 | 365 | 765 | N.A. | 394 | ||
| Profile H‡ | SMT 0 | 15,422 | N.A. | N.A. | 2,777 | −277 | 710 | 2,366 | 3,373 | 7,071 | N.A. | 3,643 |
| Profile H‡ | SMT 6 | 18,200 | 165 | 217 | N.A. | −3,055 | −2,067 | 2,771 | 3,951 | 8,282 | N.A. | 4,267 |
| Profile H‡ | SMT 12 | 15,145 | −12 | −14 | N.A. | 988 | 2,292 | 3,268 | 6,851 | N.A. | 3,530 | |
| Profile H‡ | SMT 18 | 16,133 | 39 | 58 | N.A. | 2,412 | 3,439 | 7,210 | N.A. | 3,715 | ||
N.A.-- Not Applicable: retransformed profiles include additive cost of study treatment.
Profile M (patient characteristics reflective of the mean) — 41 year-old, college-educated, non-white or Hispanic, unmarried, non-smoking female with no previous massage or chiropractic treatment, differential treatment confidence score 0, and baseline pain, disability and QALY scores of 51, 45, and 0.76, respectively. She had treatment costs of $35, and treatment plus lost productivity costs of $600 in the 4 wks preceding study enrollment.
Profile L (variables one standard deviation away from mean predicted to lower costs) — 27 year-old, non-white or Hispanic, unmarried, low-income, non-smoking male with no previous massage or chiropractic treatment, differential treatment confidence score 0, and baseline pain, disability and QALY scores of 60, 30, and 0.85, respectively. He had treatment costs of $5, and treatment plus lost productivity costs of $200 in the 4 wks preceding study enrollment.
Profile H (variables one standard deviation away mean predicted to raise costs) --55 year-old, college-educated, white non-Hispanic, married, non-smoking female with prior massage and chiropractic treatment, differential treatment confidence score 1, and baseline pain, disability and QALY scores of 40, 55, and 0.65, respectively. She had treatment costs of $55 and treatment plus lost productivity costs of $1200 in the 4 wks preceding study enrollment.