BIFOCAL CONTROL OF MYOPIA
Tables of Results

Table 4

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 the 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 = 11
M 12.45 -0.45 -0.32 0.08 0.05
Mdn 11.00 -0.50 -0.50 -0.04 -0.04
SD 3.85 0.92 0.80 0.30 0.25
control age 6-8
N = 51
M 11.84 -0.49 -0.47 -0.67 -0.64
Mdn 11.00 -0.62 -0.75 -0.63 -0.56
SD 3.03 0.99 1.01 0.45 0.43
df = 60t 0.473 0.113 0.545 6.562 6.951
LC insig. insig. insig. 0.001 0.001
bifocal age 9
N = 14
M 13.07 -1.16 -1.13 -0.01 0.01
Mdn 13.50 -1.38 -1.25 -0.06 -0.05
SD 2.15 1.14 1.20 0.22 0.24
control age 9
N = 41
M 13.00 -1.18 -1.23 -0.56 -0.56
Mdn 12.00 -1.50 -1.50 -0.50 -0.48
SD 2.77 1.08 1.06 0.37 0.35
df = 53t 0.095 0.063 0.270 6.526 6.510
LC insig. insig. insig. 0.001 0.001
bifocal age 10
N = 25
M 13.80 -0.81 -0.79 -0.05 -0.04
Mdn 13.00 -0.50 -0.75 -0.04 -0.04
SD 2.00 1.67 1.94 0.14 0.17
control age 10
N = 50
M 13.50 -1.35 -1.24 -0.59 -0.57
Mdn 13.00 -1.38 -1.25 -0.50 -0.50
SD 2.37 0.95 1.12 0.39 0.35
df = 73t 0.566 1.480 1.046 8.521 8.782
LC insig, insig. insig. 0.001 0.001
bifocal age 11
N = 26
M 14.65 -1.62 -1.56 -0.05 -0.09
Mdn 14.50 -1.19 -1.25 -0.09 -0.11
SD 1.86 1.47 1.62 0.22 0.16
control age 11
N = 56
M 15.02 -1.60 -1.42 -0.51 -0.53
Mdn 14.00 -1.62 -1.62 -0.43 -0.44
SD 2.97 1.01 1.19 0.32 0.35
df = 80t 0.677 0.062 0.367 7.489 7.716
LCinsig. insig. insig. 0.001 0.001
bifocal age 12
N = 28
M 15.89 -1.98 -1.92 -0.05-0.07
Mdn 16.00 -1.37 -1.44 -0.09 -0.07
SD 1.99 1.91 1.83 0.15 0.19
control age 12
N = 63
M 14.86 -1.76 -1.73 -0.60 -0.57
Mdn 14.00 -1.62 -1.62 -0.50 -0.50
SD 1.86 1.49 1.58 0.44 0.39
df = 89t 2.289 0.520 0.462 8.664 8.071
LC 0.05 insig. insig. 0.001 0.001
bifocal age 13
N = 44
M 16.84 -1.65 -1.60 -0.06 -0.06
Mdn 17.00 -1.25 -1.38 -0.05 -0.04
SD1.65 1.50 1.51 0.14 0.15
control age 13
N = 37
M 15.76 -1.76 -1.61 -0.49 -0.48
Mdn 15.00 -1.62 -1.62 -0.44 -0.38
SD1.76 1.19 1.20 0.30 0.30
df = 79t 2.794 0.383 0.040 7.716 7.702
LC 0.01 insig. insig. 0.001 0.001
bifocal age 14
N = 17
M 17.24 -1.84 -1.78 -0.01 -0.04
Mdn 17.00 -1.25 -1.12 -0.04 -0.05
SD 1.44 1.56 1.52 0.13 0.15
control age 14
N = 32
M 16.38 -2.13 -2.01 -0.42 -0.41
Mdn 16.00 -2.13 -1.81 -0.32 -0.31
SD 1.52 1.74 1.75 0.35 0.30
df = 47t 1.903 0.568 0.453 5.775 5.569
LC0.10 insig. insig. 0.001 0.001
bifocal age 15
N = 33
M 18.21 -2.38 -2.38 0.04 0.00
Mdn 18.00 -2.00 -2.12 -0.02 -0.03
SD 1.55 1.46 1.61 0.20 0.16
control age 15
N = 25
M 17.44 -2.31 -2.22 -0.43 -0.41
Mdn 17.00 -2.12 -1.87 -0.31 -0.38
SD1.39 1.62 1.52 0.35 0.30
df = 56t 1.952 0.172 0.377 5.889 6.115
LC0.10 insig. insig. 0.001 0.001
bifocal age 16
N = 18
M 18.56 -2.52 -2.38 0.04 0.02
Mdn 18.50 -2.12 -1.63 0.00 -0.02
SD 1.50 1.78 1.65 0.24 0.16
control age 16
N = 12
M 18.42 -2.19 -2.50 -0.38 -0.39
Mdn 18.00 -2.00 -2.31 -0.33 -0.31
SD 1.26 1.60 1.67 0.19 0.18
df = 28t 0.266 0.513 0.186 5.168 6.092
LCnsig. insig. insig. 0.001 0.001
bifocal age 17
N = 10
M 19.80 -3.09 -2.78 0.23 0.19
Mdn 19.50 -2.50 -2.44 0.07 0.07
SD1.17 2.25 1.90 0.43 0.31
control age 17
N = 16
M 19.75 -3.34 -3.17 -0.24 -0.28
Mdn 20.00 -3.25 -3.12 -0.21 -0.25
SD1.25 1.69 1.60 0.19 0.20
df = 24t 0.099 0.296 0.510 3.111 4.024
LCinsig. insig. insig. 0.001 0.001

Home     Back to Text