Table 4.
Comparison of iPad and PC Cogstate results administered the same day (test-retest sample).
| Clinic iPad | Clinic PC | Mean Difference | Mean Difference | |||||
|---|---|---|---|---|---|---|---|---|
| N | mean (SD) | mean (SD) | iPad – PC mean (SD) | 95% CI | t | p-value | d | |
| DET speed | 159 | 2.612 (0.119) | 2.591 (0.108) | 0.024 (0.102) | 0.008, 0.040 | 3.00 | 0.003 | −0.24 (−0.46, −0.02) |
| DET raw speed | 427.075 (144.638) | 403.336 (113.153) | 26.607 (132.891) | 5.792, 47.423 | 2.52 | 0.013 | −0.20 (−0.42, 0.02) | |
| DET variability | 0.087 (0.036) | 0.088 (0.038) | −0.002 (0.042) | −0.008 ,0.005 | −0.56 | 0.580 | 0.04 (−0.18, 0.27) | |
| DET accuracy | 1.513 (0.094) | 1.514 (0.09) | −0.005 (0.114) | −0.023 ,0.013 | −0.54 | 0.593 | 0.04 (−0.18, 0.26) | |
| DET raw accuracy | 0.988 (0.022) | 0.989 (0.02) | −0.002 (0.026) | −0.006 ,0.002 | −0.86 | 0.392 | 0.07 (−0.15, 0.29) | |
| IDN speed | 163 | 2.784 (0.082) | 2.723 (0.064) | 0.025 (0.064) | 0.015, 0.035 | 4.96 | <.001 | −0.39 (−0.61, −0.17) |
| IDN raw speed | 569.995 (117.63) | 534.51 (81.104) | 35.958 (91.175) | 21.856, 50.06 | 5.04 | <.001 | −0.39 (−0.61, −0.17) | |
| IDN variability | 0.082 (0.022) | 0.081 (0.022) | 0.001 (0.027) | −0.003 ,0.006 | 0.68 | 0.498 | −0.05 (−0.27, 0.17) | |
| IDN accuracy | 1.461 (0.117) | 1.47 (0.113) | −0.007 (0.153) | −0.031 ,0.017 | −0.59 | 0.558 | 0.07 (−0.17, 0.26) | |
| IDN raw accuracy | 0.975 (0.03) | 0.977 (0.029) | −0.002 (0.040) | −0.008 ,0.004 | −0.70 | 0.486 | 0.06 (−0.16, 0.27) | |
| OCL speed | 163 | 3.021 (0.076) | 3.010 (0.710) | 0.01 (0.051) | 0.002, 0.017 | 2.42 | 0.016 | −0.19 (−0.41, 0.03) |
| OCL raw speed | 1066.006 (199.155) | 1037.028 (182.157) | 25.11 (129.100) | 5.142, 45.078 | 2.48 | 0.014 | −0.19 (−0.41, 0.02) | |
| OCL variability | 0.133 (0.034) | 0.136 (0.033) | −0.004 (0.034) | −0.010 ,0.001 | −1.61 | 0.109 | 0.13 (−0.09, 0.34) | |
| OCL accuracy | 1.029 (0.086) | 1.039 (0.084) | −0.009 (0.103) | −0.025, 0.007 | −1.13 | 0.261 | 0.09 (−0.13, 0.31) | |
| OCL raw accuracy | 0.731 (0.075) | 0.74 (0.073) | −0.008 (0.090) | −0.022 ,0.006 | −1.14 | 0.255 | 0.09 (−0.13, 0.31) | |
| ONB speed | 163 | 2.915 (0.087) | 2.890 (0.078) | 0.026 (0.063) | 0.016, 0.035 | 5.17 | <.001 | −0.41 (−0.63, −0.18) |
| ONB raw speed | 839.169 (172.751) | 788.903 (144.592) | 51.314 (128.131) | 31.495, 71.132 | 5.11 | <.001 | −0.40 (−0.62, −0.18) | |
| ONB variability | 0.12 (0.033) | 0.125 (0.028) | −0.005 (0.032) | −0.010, 0.000 | −1.96 | 0.052 | 0.15 (−0.07, 0.37) | |
| ONB accuracy | 1.419 (0.126) | 1.417 (0.125) | 0.001 (0.147) | −0.021, 0.024 | 0.12 | 0.901 | −0.01 (−0.23, 0.21) | |
| ONB raw accuracy | 0.962 (0.04) | 0.962 (0.044) | −0.001 (0.046) | −0.008 ,0.006 | −0.21 | 0.834 | 0.02 (−0.20, 0.23) | |
| GMLT MPS | 160 | 0.737 (0.158) | 0.632 (0.135) | 0.109 (0.132) | 0.088, 0.129 | 10.42 | <.001 | −0.82 (−1.05, −0.59) |
| GMLT total errors | 48.327 (16.348) | 44.344 (13.983) | 3.244 (14.599) | 0.964, 5.523 | 2.81 | 0.006 | −0.22 (−0.44, 0.00) |
Note. Higher values for speed variables indicate slower response time; higher GMLT MPS indicate faster response time. PC = personal computer; SD = standard deviation; DET = Detection; IDN = Identification; OCL = One Card Learning; ONB = One Back; GMLT = Groton Maze Learning Test; MPS = Moves Per Second.