Percentage of Dependent Variable Variance Accounted for by Independent Variable(s) | |||||||
---|---|---|---|---|---|---|---|
Test Design | Independent Variables That Account for Variance in Dependent Variable | Input Resistance | Depolarization Threshold | Rheobase | ΔI | Recruitment Current | Derecruitment Current |
One-factor | AHP half-decay time | 20.8** | 40.6*** | 43.5*** | 21.8* | 45.6*** | 47.2*** |
RMP | 12.7* | 28.7** | 35.4** | 2.1 | 61.8*** | 60.2*** | |
Two-factor | All factors | 22.2* | 45.9** | 65.0*** | 22.8* | 77.0*** | 77.0*** |
AHP half-decay time (unique) | 9.9 | 17.3* | 29.7** | 21.4* | 16.8** | 18.6** | |
RMP (unique) | 2.8 | 9.0 | 22.8** | 0.3 | 33.6*** | 31.6*** | |
AHP half-decay time and RMP (common) | 9.5 | 19.6 | 12.5 | 1.1 | 26.6 | 26.8 |
-
Regressions of input resistance, depolarization threshold (voltage excursion from RMP to reach the action potential threshold), rheobase (current threshold for action potential initiation during 40-ms depolarizing pulse), ΔI (ramp decrecruitment − recruitment current), ramp recruitment current, and ramp derecuitment current on AHP half-decay time and/or RMP determine the variance they account for in the dependent variables. The two-factor analyses show the percentage of the dependent variable variance accounted for by the variation in: all factors together (All factors), the unique contribution of each independent variable (unique), and the variance that is common among independent variable (common; calculated as the difference between the variance accounted for by the entire model and the sum of the unique contributions of the independent variables individually).
-
↵* P < 0.05,
-
↵** P < 0.01, and
-
↵*** P < 0.001, variance accounted for by variable(s) significantly different from zero.