Table 5.

Comparison of nocturnal penile tumescence and rigidity parameters of the first and second nights when patients in Group A (both-night erections) were stratified by age

Parameters	Years
	18-29	30-39	40-49	50-60
Patients (n)	28	24	10	3
EEEs (n)
N1	2.1±1.1	2.2±1.0	2.3±1.2	2.7±2.1
N2	2.6±1.0*	2.9±1.6*	2.1±1.2	2.3±0.6
TET (h)
N1	1.6±1.3	1.4±0.8	1.8±1.2	1.4±0.9
N2	1.8±0.6	1.4±0.8	2.1±1.9	1.8±0.8
Tip RAUs
N1	49.2±29.1	45.8±17.5	56.4±24.5	52.3±42.9
N2	67.7±22.8*	66.4±28.8*	48.4±21.2	47.0±33.9
Base RAUs
N1	53.2±34.0	54.9±25.3	62.4±28.4	62.3±38.2
N2	76.0±30.8*	73.5±31.8*	57.4±28.1	50.3±26.0
Tip TAUs
N1	26.3±20.7	27.6±13.4	46.4±48.9	30.7±24.8
N2	40.6±22.5*	39.4±26.4*	23.8±11.0	22.7±11.6
Base TAUs
N1	34.1±34.4	31.3±17.0	41.5±25.4	30.3±13.5
N2	43.8±25.7	42.4±28.0	29.8±15.3	26.7±11.1
Tip AER (%)
N1	57.8±18.5	61.2±14.2	62.8±21.2	59.7±10.7
N2	60.5±15.9	60.5±18.4	60.0±10.2	71.3±23.5
Base AER (%)
N1	60.6±16.2	66.7±13.1	68.1±24.2	78.0±3.5
N2	64.6±15.9	65.6±17.5	68.9±14.9	81.0±10.4
Tip D60% (min)
N1	50.0±31.6	49.1±21.8	69.8±40.2	61.7±57.9
N2	67.1±26.2*	68.6±36.2*	53.5±30.3	48.1±34.5
Base D60% (min)
N1	61.2±40.4	59.5±28.1	75.2±43.9	73.8±48.8
N2	85.4±38.6*	78.4±38.3*	67.6±46.3	58.2±29.2
Tip MT (cm)
N1	8.2±1.0	8.3±1.0	8.2±0.6	8.9±0.5
N2	8.5±0.7	7.7±0.9*	8.2±0.9	7.8±0.5
Base MT (cm)
N1	7.7±1.2	8.0±1.0	7.8±0.6	8.6±1.0
N2	8.3±1.0	7.6±1.1	8.2±0.8	8.3±1.0

Data are expressed as mean±s.d. ^*P<0.05, when measurement on the second night was compared with that on the first night. AER: average event rigidity; D60%: duration of erectile episodes with rigidity ≥60%; EEEs: effective erectile events; MT: maximal tumescence; N1: the first night; N2: the second night; RAUs: rigidity activated units; TAUs: tumescence activated units; TET: total erection time; s.d.: standard deviation