TABLE 1.
Main effects | Interaction effects | ||||||
---|---|---|---|---|---|---|---|
IPGa | PDa | Group | IPG × PDa | IPG × groupa | PD × groupa | ||
Amplitude | F | 56.9 (1.2, 17) | 28.9 (1.4, 20) | 11.6 (2, 14) | 13.5 (4.7, 66) | 1.0 (2.4, 17) | 1.0 (2.8, 20) |
P | <0.001 | <0.001 | 0.0011 | <0.001 | 0.42 | 0.42 | |
Slope | F | 40.1 (1.1, 15) | 11.0 (2.2, 30) | 11.3 (2, 14) | 4.8 (4.8, 68) | 5.3 (2.2, 15) | 0.84 (4.3, 30) |
P | <0.001 | <0.001 | 0.0011 | <0.001 | 0.016 | 0.52 | |
Threshold | F | 131 (1.5, 21) | 6.4 (2.3, 32) | 2.3 (2, 14) | 13.8 (2.9, 40) | 2.1 (3.0, 21) | 1.6 (4.6, 32) |
P | <0.001 | 0.0034 | 0.13 | <0.001 | 0.13 | 0.21 | |
Dynamic range | F | 15.8 (1.3, 18) | 3.7 (2.3, 32) | 9.4 (2, 14) | 3.3 (3.4, 48) | 5.5 (2.6, 18) | 1.6 (4.6, 32) |
P | <0.001 | 0.031 | 0.0026 | 0.024 | 0.0089 | 0.20 | |
Level50% | F | 242 (1.9, 27) | 2.9 (1.4, 20) | 3 (2, 14) | 28.6 (4.5, 62) | 6.1 (3.9, 27) | 0.55 (2.9, 20) |
P | <0.001 | 0.091 | 0.31 | <0.001 | 0.0013 | 0.65 | |
Latency | F | 28.2 (1.9, 26) | 247 (2.6, 37) | 4.9 (2, 14) | 4.1 (7.1, 100) | 13.6 (3.7, 26) | 0.74 (5.3, 37) |
P | <0.001 | <0.001 | 0.024 | <0.001 | <0.001 | 0.60b |
Degrees of freedom given in brackets
aGreenhouse–Geisser corrected
bInteraction of PD × IPG × group was significant [F (14,100) = 1.8; P = 0.049]