Table 4.
Fit Statistics for Measurement Invariance of the BTACT Factor Models across Traumatic Brain Injury (TBI) and Orthopedic Trauma Control (OTC) Groups
| -2LL | k | BIC | RMSEA | ΔRMSEA | CFI | ΔCFI | TLI | |
|---|---|---|---|---|---|---|---|---|
| 1-factor modela | ||||||||
| Configural | -19976 | 76 | 40501 | 0.036 | 0.993 | 0.988 | ||
| Weak | -19983 | 61 | 40406 | 0.027 | -0.009 | 0.995 | 0.002 | 0.993 |
| Strong | -19997 | 46 | 40326 | 0.034 | 0.007 | 0.989 | -0.006 | 0.989 |
| Strict | -20017 | 25 | 40215 | 0.038 | 0.004 | 0.981 | -0.008 | 0.986 |
| 2-factor model | ||||||||
| Configural | -19984 | 72 | 40488 | 0.046 | 0.988 | 0.980 | ||
| Weak | -19988 | 63 | 40431 | 0.040 | -0.006 | 0.989 | 0.001 | 0.985 |
| Strong | -19998 | 51 | 40364 | 0.041 | 0.001 | 0.985 | -0.004 | 0.984 |
| Strict | -20016 | 33 | 40270 | 0.043 | 0.002 | .0978 | -0.007 | 0.982 |
a
1-factor model with correlated residuals between the two episodic memory trials.
Four groups were included in the model: the OTC group and three TBI groups, defined by Glasgow Coma Scale (GCS) score 13–15 without acute intracranial findings on computed tomography (CT) scans, GCS 13–15 with acute intracranial findings on CT, and GCS 3–12.
BIC, Bayesian information criterion; BTACT, Brief Test of Adult Cognition by Telephone; CFI, Comparative Fit Index; k, free parameters; LL, log likelihood; RMSEA, root mean square error of approximation; TLI, Tucker-Lewis index.