The results of two way ANOVA (with the given signal parameter being the dependent variable and age and the subject group being the two independent variables).

Statistically significant differences satisfying the criterion of equality of variances are marked in bold font.CG – control group; GODA – glaucoma suspects with glaucomatous optic disc appearance; POAG – primary open angle glaucoma; PACG – primary angle closure glaucoma; τ(ECG, BPL) – time delay between R wave peak of ECG and systolic BPL peak; τ(ECG, maxODP1) – time delay between R wave peak of ECG and the first major ODP maximum; τ(ECG, maxODP2) – time delay between R wave peak of ECG and the second major ODP maximum; τ(BPL, maxODP1) – time delay between systolic BPL peak and the first major ODP maximum; τ(BPL, maxODP2) – time delay between systolic BPL peak and the second major ODP maximum; preCT – preliminary crest time - time taken from minimum to the first major maximum of ODP shape; CT – crest time - time taken from minimum to maximum of ODP shape; HCT – time duration of heart cycle, taken from R peak to the next R peak of ECG shape; preRCT = preCT/HCT*100% – preliminary relative crest time; RCT = CT/HCT*100% – relative crest time and HR – the heart rate.