Table 2 The description of all the variables in the GEE model
Independent Variable (IV) (categorical in italic) | Dependent Variable (DV) | ||
|---|---|---|---|
A | Age | a-amp | a-wave amplitude (µV) |
I | Iris colour index (iris pigmentation measure) | a-time | a-wave time-to-peak (ms) |
V | Vertical location of the electrode (five levels, mm) | b-amp | b-wave amplitude (µV) |
G | Participant Group (ASD, control and ADHD) | b-time | b-wave time-to-peak (ms) |
e | Left eye or right eye | p72 | PhNR amplitude at time 72ms (µV) |
s | sex (male or female) | PhNRmin | PhNRmin amplitude (µV) |
M | Medication (taken or not-taken before the ERG recording) | Tmin | Tmin (ms) |
E | Ethnicity | p-ratio | p72/(b-wave amplitude – a-wave amplitude) |
FS | Flash Strengths at: -0.367, -0.119, 0.114, 0.398, 0.602, 0.799, 0.949, 1.114 and 1.204 log phot cd.s.m-2 & ISCEV LA3 standard flash (0.477) | w-ratio | PhNRmin/(b-wave amplitude – a-wave amplitude) |
FS•G | ‘•’ stands for interaction. |  |  All DVs are numeric, see description in Fig. 1. |