Variables Class 1 (ref.): Stable, low risk Class 2: Stable, high risk Class 3:Progressive, moderate Class 4:Progressive, rapid
#Eyes#Progressive Eyes (%) 84
2 (2.4%)
123
13(10.6%)
54
26 (48.1%)
16
16 (100%)
FPC parameters
Mean of MD scores
Mean of PSD scores
Variance of MD scores
Variance of PSD scores
12.63 ± 0.83 
-5.73 ± 0.28 
19.27 ± 4.29 
4.09 ± 0.76 
2.44 ± 1.16 
-3.67 ± 0.59
54.21 ± 12.42 
22.93 ± 4.43 
-11.03 ± 1.97
9.86 ± 1.58
107.03 ± 22.40
68.70 ± 10.16
 -53.75 ± 5.63
20.90 ± 3.84
370.12± 118.65
165.54 ± 45.92
Covariates
Intercept
age
pattern standard deviation
intraocular pressure
central corneal thickness
horizontal  cup/disc ratio          
-
-
-
-
-
-
  1.63 ± 0.75*
0.69 ± 0.35*
2.62 ± 0.80#
-0.24 ± 0.36
0.53 ± 0.43
0.08 ± 0.25
  0.47 ± 0.73
0.82 ± 0.38*
3.58 ± 0.85#
0.44 ± 0.33
-0.39 ± 0.44
0.01 ± 0.26
-2.26 ± 1.15*
1.78 ± 0.50#
4.36 ± 0.89#
0.98 ± 0.55  
-0.33 ± 0.72  
0.43 ± 0.38  
*p<0.05, #p<0.001: indicating the significance comparing to the reference group (Class 1).
Table 3: Estimated parameters and their standard errors of the latent class model based on FPC scores.