BIFOCAL CONTROL OF MYOPIA
Tables of Results

Table 5

Means (M), Medians (Mdn), Standard Deviations (SD) and t-tests with degrees of freedom (df) and levels of confidence (LC) for the ending age, beginning refraction and annual rate of progression for the right (OD) and left (OS) eyes of combined Native American and Caucasian bifocal and control groups (all refractive errors in diopters - D).
Group, Age
Number and df
Measure Ending
Age
Beginning Rx (D) Annual Rates (D)
OD OS OD OS
bifocal age 6-8
N = 16
M11.81 -0.41 -0.33 0.06 0.04
Mdn 11.00 -0.19 -0.25-0.03-0.04
SD 3.50 0.89 0.86 0.30 0.25
control age 6-8
N = 74
M 11.59 -0.45 -0.41 -0.61 -0.57
Mdn 11.00 -0.62 -0.56 -0.55 -0.50
SD 3.01 1.11 1.13 0.46 0.45
df =88t 0.227 0.155 0.331 7.142 7.310
LC insig. insig. insig. 0.001 0.001
bifocal age 9
N = 17
M 13.18 -1.05 -1.02 -0.03 0.00
Mdn 14.00 -1.25 -1.25 -0.06 -0.06
SD 2.12 1.16 1.22 0.21 0.22
control age 9
N = 53
M 13.09 -1.04 -1.06 -0.53 -0.53
Mdn 12.00 -1.25 -1.25 -0.44 -0.48
SD 2.80 1.08 1.12 0.38 0.35
df = 68t 0.156 0.040 0.108 6.738 7.063
LC insig. inslg. insig. 0.001 0.001
bifocal age 10
N = 30
M 13.77 -0.70 -0.70 -0.07 -0.05
Mdn 14.00 -0.56 -0.69 -0.06 -0.06
SD 1.91 1.58 1.81 0.16 0.17
control age 10
N = 59
M 13.63 -1.29 -1.16 -0.56 -0.55
Mdn 13.00 -1.37 -1.25 -0.48 -0.48
SD2.34 0.97 1.18 0.38 0.35
df = 87t 0.298 1.849 1.236 8.479 9.202
LC insig. insig. insig. 0.001 0.001
bifocal age 11
N = 32
M 14.41 -1.53 -1.55 -0.05 -0.08
Mdn 14.00 -1.12 -1.25 -0.09 -0.11
SD 1.78 1.44 1.54 0.23 0.20
control age 11
N = 63
M 14.83 -1.60 -1.45 -0.52-0.54
Mdn 14.00 -1.62 -1.62 -0.44 -0.46
SD 2.89 0.98 1.14 0.33 0.35
df = 92t 0.863 0.230 0.311 7.957 7.985
LC insig. insig. insig. 0.001 0.001
bifocal age 12
N = 35
M 15.60 -1.85 -1.80 -0.07 -0.09
Mdn 16.00 -1.37 -1.50 -0.09 -0.08
SD 1.94 1.79 1.70 0.15 0.18
control age 12
N = 78
M14.77 -1.67 -1.62 -0.56 -0.53
Mdn 14.00 -1.50 -1.44 -0.49 0.43
SD 1.74 1.43 1.53 0.43 0.38
df = 111t 2.143 0.511 0.537 8.825 8.129
LC0.05 insig. insig. 0.001 0.001
bifocal age 13
N = 50
M 16.70 -1.69 -1.65 -0.09 -0.08
Mdn 17.00 -1.25 -1.37 -0.06 -0.06
SD 1.64 1.51 1.52 0.17 0.16
control age 13
N = 53
M 15.96 -1.80 -1.70 -0.42 -0.40
Mdn 15.00 -1.75 -1.62 -0.37 -0.37
SD 1.77 1.21 1.27 0.32 0.32
df = 101t 2.181 0.383 0.171 6.378 6.296
LC 0.05 insig. insig. 0.001 0.001
bifocal age 14
N = 21
M 17.24 -1.87 -1.88 -0.01 -0.02
Mdn 17.00 -1.37 -1.25 -0.06 -0.06
SD 1.51 1.46 1.47 0.13 0.20
control age 14
N = 40
M 16.47 -2.16 -2.08 -0.42 -0.41
Mdn 16.00 -2.37 -2.13 -0.32 -0.31
SD 1.58 1.59 1.60 0.39 0.33
df =59t 3.444 0.704 0.495 5.904 5.541
LC0.01 insig. insig. 0.001 0.001
bifocal age 15
N = 40
M 18.13 -2.33 -2.33 -0.01 -0.02
Mdn 18.00 -2.06 -2.19 -0.04 -0.04
SD 1.63 1.45 1.58 0.19 0.16
control age 15
N = 39
M 17.74 -2.14 -1.99 -0.35 -0.33
Mdn 18.00 -2.00 -1.75 -0.25 -0.31
SD 1.63 1.67 1.52 0.32 0.30
df = 77t 1.050 0.549 0.948 5.632 5.756
LCinsig. insig. insig. 0.001 0.001
bifocal age 16
N = 18
M18.56-2.52-2.380.040.02
Mdn18.50-2.12-1.630.00-0.02
SD 1.50 1.781.650.240.16
control age 16
N = 19
M18.32-2.21-2.31-0.39-0.34
Mdn 18.00 -1.62 -1.75-0.32-0.31
SD1.031.591.640.300.18
df = 35t0.5491.0810.1164.7206.128
LCinsig.insig.insig.0.0010.001

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