Table 2. Mean thickness of different optical coherence tomography parameters.

Parameters	Normal	PPG	PG					P value from post hoc analysisb
			Overall	Mild	Moderate	Severe	Pa	Normal vs PPG	Normal vs PG	PPG vs PG
RNFL global	103.93±10.46	94.41±10.92	81.26±20.31	91.16±17.91	72.88±15.34	76.36±24.51	<0.001	0.006	<0.001	<0.001
RNFL ST	143.5±20.51	128.76±24.03	114.41±31.67	127.89±27.09	106.63±25.16	102.45±40.55	<0.001	0.17	<0.001	0.008
RNFL SN	113.8±25.55	100.67±24.19	89.15±28.12	98.32±28.0	77.31±20.72	90.55±33.41	<0.001	0.03	<0.001	0.031
RNFL IN	116.63±22.39	101.51±21.73	86.83±29.12	98.05±23.93	71.31±21.79	90.0±37.89	<0.001	0.01	<0.001	0.004
RNFL IT	139.53±27.62	138.69±20.43	109.83±39.23	127.74±31.10	101.0±30.73	91.73±51.71	<0.001	0.9	<0.001	<0.001
RNFL N	74.57±19.58	64.88±17.49	58.93±19.53	68.58±16.56	50.81±16.63	54.09±22.35	0.002	0.03	0.001	0.121
RNFL T	80.57±10.8	74.82±12.09	66.26±18.16	70.05±19.75	63.06±15.67	64.36±19.13	<0.001	0.84	<0.001	0.004
BMO area (mm2)	1.98±0.36	2.37±0.46	2.45±0.53	2.52±0.57	2.30±0.45	2.54±0.57	<0.001	0.001	<0.001	0.405
MRW global	287.80±58.71	245.39±28.772	201.86±55.51	223.16±52.65	179.60±43.71	194.80±66.11	<0.001	<0.001	<0.001	<0.001
MRW ST	301.1±45.87	241.02±47.09	197.57±66.71	216.58±58.99	181.80±57.60	185.10±88.26	<0.001	<0.001	<0.001	<0.001
MRW SN	340.53±63.17	278.53±52.02	237.27±72.18	265.32±66.65	217.47±58.82	213.70±87.73	<0.001	<0.001	<0.001	0.002
MRW N	318.33±62.43	262.75±45.62	220.91±68.30	253.11±60.91	187.73±58.90	209.50±72.82	<0.001	<0.001	<0.001	0.001
MRW IN	359.73±67.35	291.90±43.14	242.73±75.31	257.47±79.18	220.80±56.40	247.60±91.23	<0.001	<0.001	<0.001	<0.001
MRW IT	305.77±56.59	264.31±41.57	211.48±70.10	242.68±56.52	188.0±55.19	187.40±93.43	<0.001	0.002	<0.001	<0.001
MRW T	203.77±35.18	172.04±31.88	145.0±41.10	156.79±36.71	126.60±35.87	150.20±49.87	<0.001	<0.001	<0.001	<0.001
GCL OS	33.70±4.36	31.88±4.61	29.47±5.72	30.39±6.24	28.38±5.02	29.55±6.06	0.002	1.117	<0.001	0.02
GCL ON	38.0±4.21	37.28±3.78	34.02±6.38	35.94±5.15	31.69±6.80	34.27±7.03	0.001	0.531	0.001	0.002
GCL OI	29.70±4.13	30.16±3.64	26.91±5.63	28.83±4.54	25.81±5.62	25.36±6.76	0.002	0.663	0.011	0.001
GCL OT	32.07±3.78	32.08±5.03	28.56±6.20	31.39±4.85	27.19±5.34	25.91±7.83	0.002	0.991	0.005	0.001

PPG: Preperimetric glaucoma; PG: Perimetric glaucoma; RNFL: Retinal nerve fibre layer; BMO: Bruch's membrane opening; MRW: Minimum-rim-width; GCL: Ganglion cell layer; ST: Superotemporal; SN: Superonasal; IN: Inferonasal; IT: Inferotemporal; OS: Outer superior; OI: Outer inferior; OT: Outer temporal; ON: Outer nasal; ^aAnalysis of variance; ^bPost hoc analysis using least significant difference formula.

µm, mean±SD