Table 3.
Comparative Results of the Full Versus Truncated Analyzes From Each Data set and Their Implications for the Comparative Direct Costs of 2-Y Versus Full Life-Span Study*
| Study | Treatment Group | N | β2y | βfull | Difference | p Value | Variance Ratio | Cost Ratio |
| 1 | A | 45 | −1.249 | –0.614 | 0.6352 | .055 | 3.1 | 3.9 |
| 1 | B | 45 | −0.644 | 0.008 | 0.6523 | .006 | 2.2 | |
| 1 | C | 45 | −1.386 | –0.308 | 1.0776 | .002 | 3.4 | |
| 1 | D | 45 | 1.589 | 2.083 | 0.4937 | .001 | 1.2 | |
| 1 | E | 45 | −0.872 | –0.444 | 0.4286 | .123 | 2.5 | |
| 1 | F | 45 | −0.742 | –0.327 | 0.4151 | .139 | 2.4 | |
| 1 | G | 45 | −0.927 | –0.323 | 0.6039 | .064 | 2.6 | |
| 2 | A | 41 | −0.968 | –0.759 | 0.2086 | .168 | 1.6 | 4.0 |
| 2 | B | 39 | −0.437 | –0.720 | –0.2830 | .027 | 1.2 | |
| 2 | C | 49 | −0.405 | –0.540 | –0.1346 | .217 | 1.3 | |
| 2 | D | 48 | −0.303 | –0.441 | –0.1377 | .192 | 1.3 | |
| 3 | A | 16 | 0.797 | 0.756 | –0.0406 | .693 | 1.2 | 1.8 |
| 4 | A | 98 | −0.205 | –0.039 | 0.1660 | .506 | 3.4 | 3.7 |
| 4 | B | 99 | −0.111 | 0.020 | 0.1302 | .557 | 3.3 | |
| 4 | C | 99 | 0.289 | 0.171 | –0.1179 | .459 | 2.7 | |
| 4 | D | 99 | −0.311 | 0.084 | 0.3954 | .090 | 3.6 | |
| 4 | E | 97 | 0.249 | 0.073 | –0.1764 | .332 | 2.7 | |
| 5 | A | 60 | −0.866 | –0.160 | 0.7054 | .008 | 2.9 | 2.9 |
| 5 | B | 60 | −0.030 | –0.047 | –0.0174 | .873 | 2.0 | |
| 6 | A | 298 | 0.003 | –0.030 | –0.0334 | .671 | 3.0 | 4.0 |
| 6 | B | 308 | −0.310 | –0.070 | 0.2402 | .043 | 3.6 | |
| 6 | C | 308 | −0.385 | –0.218 | 0.1678 | .135 | 3.8 | |
| 6 | D | 308 | −0.189 | –0.002 | 0.1874 | .096 | 3.4 | |
| 7 | A | 206 | −0.063 | 0.286 | 0.3485 | .114 | 5.9 | 3.6 |
| 7 | B | 57 | 0.308 | 0.241 | –0.0667 | .747 | 4.7 | |
| 7 | C | 51 | 0.518 | 0.106 | –0.4127 | .114 | 4.0 | |
| 8 | A | 47 | −1.307 | –2.148 | –0.8414 | .646 | 2.3 | 2.6 |
| 8 | B | 28 | −0.778 | –1.141 | –0.3624 | .905 | 2.2 | |
| 8 | C | 35 | −1.711 | –2.233 | –0.5214 | .398 | 7.0 | |
| 8 | D | 38 | 0.256 | 0.088 | –0.1675 | .129 | 6.5 | |
| 8 | E | 32 | 0.524 | 0.481 | –0.0427 | .450 | 5.9 | |
| 9 | A | 60 | −0.187 | –0.240 | –0.0535 | .947 | 4.2 | 3.9 |
| 9 | B | 55 | −0.224 | –0.160 | 0.0641 | .848 | 4.2 | |
| 9 | C | 54 | −0.605 | –0.300 | 0.3046 | .586 | 5.3 | |
| 9 | D | 55 | −0.599 | –0.510 | 0.0888 | .878 | 5.3 | |
| 9 | E | 55 | −1.369 | –0.790 | 0.5792 | .547 | 8.4 | |
| 9 | F | 55 | −0.851 | –0.510 | 0.3412 | .576 | 5.9 | |
| 9 | G | 55 | 0.997 | 0.590 | –0.4068 | .317 | 3.0 | |
| 9 | H | 55 | −0.016 | –0.100 | –0.0839 | .878 | 4.2 | |
| 10 | A | 44 | −0.512 | 0.027 | 0.5385 | .507 | 11.6 | 1.8 |
| 10 | B | 45 | 0.185 | –0.251 | –0.4365 | .585 | 7.9 | |
| 11 | A | 51 | −0.041 | –0.144 | –0.1035 | .927 | 24.0 | 2.1 |
| 12 | A | 57 | −0.996 | –1.150 | –0.1535 | .696 | 6.4 | 2.4 |
| 12 | B | 60 | −2.696 | –3.719 | –1.0236 | .317 | 12.6 | |
| 12 | C | 71 | −2.168 | –3.212 | –1.0444 | .165 | 7.7 | |
| 13 | A | 74 | −0.221 | –0.897 | –0.6759 | .137 | 7.1 | 2.3 |
| 14 | A | 67 | −1.818 | –0.773 | 1.0450 | .447 | 34.0 | 2.1 |
| 15 | A | 53 | −2.161 | –2.055 | 0.1059 | .916 | 4.4 | 2.8 |
| 15 | B | 51 | −0.521 | –0.713 | –0.1922 | .848 | 2.2 |
Note: *Some studies had more than two groups, which yields more than one estimated treatment effect. We have denoted each comparison within a study as A, B, etc.