Table 2.
Conner’s Continuous Performance Test-II Performance by Participant Group
| CPT Domain | No COPD (n=31) Mean (SD) | COPD (n=53) Mean (SD) | Test Statistic t or U (p value) |
|---|---|---|---|
| Inattention | |||
| Omissions | 52.8 (8.4) | 46.7 (13.8) | U = 565.50 (0.017) |
| Commissions | 55.5 (6.1) | 51.4 (8.6) | U = 577.00 (0.023) |
| Hit RT1 | 46.4 (10.5) | 49.2 (15.4) | t = −0.91 (0.368) |
| Hit RT Std. Error | 45.1 (8.3) | 43.5 (9.5) | U = 722.00 (0.356) |
| Variability | 50.7 (10.3) | 46.5 (9.7) | t = 1.85 (0.068) |
| Detectability | 55.8 (8.0) | 51.0 (8.8) | t = 2.51 (0.014) |
| Hit RT ISI Change2 | 45.1 (11.3) | 48.3 (11.4) | t = −1.25 (0.214) |
| Hit RT SE ISI Change3 | 43.9 (14.4) | 47.3 (12.1) | t= −1.16 (0.250) |
| Impulsivity | |||
| Commissions | 55.5 (6.1) | 51.4 (10.6) | U = 577.00 (0.023) |
| Hit RT1 | 46.4 (10.5) | 49.2 (15.4) | t = −1.00 (0.368) |
| Perseverations | 52.3 (12.1) | 45.8 (14.8) | U = 521.00 (0.004) |
| Vigilance | |||
| Hit RT Block Change4 | 52.6 (9.8) | 51.2 (10.6) | U =688.00 (0.216) |
| Hit SE Block Change5 | 47.7 (8.0) | 46.5 (8.0) | t =0.70 (0.487) |
Bolded values indicate significantly different mean values for former smokers with and without COPD, as determined via t-test or Mann-Whitney U test, with greater values indicating better performance
1
Hit Reaction Time
2
Hit Reaction Time Inter Stimulus Interval Change
3
Hit Reaction Time Standard Error Inter Stimulus Interval Change
4
Hit Reaction Time Block Change
5
Hit Standard Error Block Change