23
Results
Table 1 below gives summary of IOP characteristics of the group,
showing measurements to have similar distributions.
Table 1: Summary of TonoCare and Perkins AT IOP measurements.
No pairing structure is summarised in this table. *Standard deviation.
†
Only Perkins AT IOP categories are used for sub-group analyses, n is given in terms of eyes.
** In order to obtain measurements in this range, an inversion procedure was performed on a
subset of participants while taking IOP measurements.
Table 2 categorises the absolute differences between TonoCare
and Perkins AT IOP measurements >5mmHg overall, and within 3
IOP subgroups. A difference greater than the tolerance of
±5mmHg occurred in 1 (0.7%) eye out of 144, well below the
maximum level of 5% according to the standard.
Table 2: Differences between TonoCare and Perkins AT IOP
measurements >5mm Hg overall, and within 3 IOP subgroups.
* IOP TonoCare – IOP Perkins AT.
†
Based on Perkins AT measured IOP.
** In order to obtain measurements in this range, an inversion procedure was performed on a
subset of participants while taking IOP measurements.
Summary parameters of differences between pairs of TonoCare
and Perkins AT IOP measurements are given in Table 3 below, for
the full sample and by each IOP group. Overall the mean of IOP
differences between TonoCare and Perkins AT was <0.01 mmHg,
with a median of -0.2mmHg. The 95% limits of agreement, based
on the mean of IOP differences ±1.96 × the standard deviation of
the IOP differences was -3.4mmHg to +3.4mmHg.
3.2.6 Clinical performance data
(continued)
TonoCare
Perkins AT
N, eyes (patients)
144 (72)
144 (72)
Mean IOP, mmHg
21.2
21.2
Median IOP, mmHg
18.0
17.0
SD*, mmHg
7.9
8.0
Range, mmHg
11.8 to 46.3
11.0 to 41.0
IOP 7 to 16mmHg, n (%)
†
42 (29.2)
51 (35.4)
IOP 17 to 23mmHg, n (%)
†
58 (40.3)
49 (34.0)
IOP >23mmHg**, n (%)
†
44 (30.6)
44 (30.6)
IOP Group
†
7 to
16mmHg
17 to
23mmHg >23mmHg**
Total
Difference*
Does not
exceed
±5mm Hg
51
49
43
143
Exceeds
±5mmHg
0
0
1
1
Total
51
49
44
144
Содержание Tonocare
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