Table 1: Baseline characteristics of the cohorts.
|
Characteristics |
Study group |
Bilateral control group |
P-value |
Unilateral control group |
P-value |
|
Total amount of patients, n |
2328 |
2427 |
|
1943 |
|
|
Age at surgery (y), mean ±SD |
76,1±9,6 |
75,6±8,2 |
0,061) |
74,6±11,7 |
<0,001*1)
|
|
min (y) |
33 |
34 |
|
19 |
|
|
max (y) |
102 |
97 |
|
101 |
|
|
Female sex, n (%) |
1455 (62,50) |
1475 (60,77) |
0,222) |
1077 (55,43) |
<0,001*2)
|
|
Implanted lens design, n (%) |
|
|
|
|
|
|
monofocal |
4356 (93,56) |
4814 (99,18) |
<0,001*2) |
1943 (100,00) |
<0,001*2) |
|
torical |
52 (1,12) |
40 (0,08) |
<0,001*2) |
0 (0,00) |
<0,001*2) |
|
multifocal |
184 (3,95) |
0 (0,00) |
<0,001*2) |
0 (0,00) |
<0,001*2) |
|
multifocal torical |
64 (1,37) |
0 (0,00) |
<0,001*2) |
0 (0,00) |
<0,001*2) |
|
AL, mean ± SD |
|
|
|
|
|
|
right eye |
23,56±1,37 |
23,61±1,15 |
0,261) |
23,58±1,29 |
0,731) |
|
data missing, n (%) |
51 (2,19) |
7 (0,29) |
|
57 (2,93) |
|
|
left eye |
23,51±1,34 |
23,58±1,15 |
0,05*1) |
23,54±1,28 |
0,52) |
|
data missing, n (%) |
55 (2,36) |
7 (0,29) |
|
64 (3,29) |
|
|
Keratometry (D), mean ± SD |
|
|
|
|
|
|
Right eye |
43,84±1,61 |
43,73±1,49 |
0,02*1) |
43,87±1,62 |
0,581) |
|
min (D) |
36,75 |
36,75 |
|
36,95 |
|
|
max (D) |
53,37 |
53,74 |
|
50,60 |
|
|
data missing, n (%) |
48 (2,06) |
6 (0,25) |
|
60 (3,09) |
|
|
Left eye |
43,93±1,62 |
43,79±1,48 |
0,02*1) |
43,92±1,62 |
0,911) |
|
min (D) |
38,42 |
36,64 |
|
33,75 |
|
|
max (D) |
52,76 |
50,45 |
|
51,92 |
|
|
data missing, n (%) |
51 (2,19) |
7 (0,29) |
|
57 (2,93) |
|
|
Preoperative refraction SE (D), mean ± SD, (min, max) |
|
|
|
|
|
|
right eye |
0,13±3,36 (-19,13, +9,50) |
-0,21±2,90 (-16,50, +8,13) |
<0,001*1) |
-0,32±2,71 (-26,38, +10,13) |
<0,001*1) |
|
data missing, n (%) |
48(2,06) |
28 (1,15) |
|
168(8,65) |
|
|
left eye |
0,19±3,27 (-20,38, +9,50) |
-0,14±2,88 (-16,38, +10,75) |
<0,001*1) |
-0,19±2,73 (-28,00, +13,50) |
<0,001*1) |
|
data missing, n (%) |
42 (1,80) |
40 (1,65) |
|
182 (9,37)
|
|
|
Preoperative risk factors per patient, mean ± SD |
0,34±0,57 |
0,23±0,47 |
<0,001*1)
|
0,61±0,71 |
<0,001*1)
|
|
Intraoperative complications per patient, mean ± SD |
0,0008±0,03 |
0,002±0,05 |
0,451) |
0,003±0,06 |
0,401) |
|
Operation time (min), mean (lower quartile, upper quartil1e) |
23,00 (20,00, 30,00) |
47,00 (42,00, 52,00) |
<0,001*1)
|
12,00 (10,00, 17,00) |
<0,001*1)
|
|
Potential time saving /operated eye min, (%) |
|
|
|
|
|
|
Vs bilateral cntr group |
12,00 (51,06%) |
|
|
|
|
|
Vs unilateral cntr group |
2,00 (16,67%) |
|
|
|
|
n=number of patients, y=years, SD, standard deviation, AL=axial length, D=diopter, SE=spherical equivalent, 1) t-Test, 2) Fisher´s exact test, *=statistically significant