Table 4 Subgroup analysis of the TMR group
Parameter (Mean ± SD) | Subgroup 1 (CA < RA) | Subgroup 2 (CA > RA) | P value |
|---|---|---|---|
Preoperative | |||
BCVA (logMAR) | −0.07 ± 0.07 | −0.07 ± 0.06 | .843 |
Sphere (D) | −2.55 ± 3.57 | − 3.74 ± 1.75 | .210 |
Cylinder (RA; D) | −1.48 ± 0.69 | −1.00 ± 0.66 | .009* |
MRSE (D) | − 3.29 ± 3.69 | − 4.24 ± 1.77 | .330 |
Flat keratometry (D) | 42.95 ± 1.29 | 42.57 ± 1.20 | .260 |
Steep keratometry (D) | 44.09 ± 1.45 | 43.99 ± 1.30 | .780 |
CA (D) | 1.14 ± 0.62 | 1.42 ± 0.63 | .111 |
Magnitude difference between CA and RA (D) | − 0.34 ± 019 | 0.43 ± 0.27 | .000* |
Axis difference between CA and RA (°) | 19.3 ± 11.1 | 25.4 ± 16.3 | .230 |
Postoperative 3 months | |||
UDVA (logMAR) | − 0.03 ± 0.11 | −0.05 ± 0.11 | .415 |
UDVA (% of logMAR 0.0 or better) | 68.8 | 82.6 | .296 |
Sphere (D) | 0.14 ± 0.79 | −0.01 ± 0.66 | .440 |
Cylinder (D) | −0.52 ± 0.23 | −0.44 ± 0.37 | .297 |
MRSE (D) | −0.12 ± 0.80 | −0.23 ± 0.67 | .571 |
MRSE (% of D within ±0.5) | 68.8 | 68.1 | .999 |
MRSE (% of D within ±1.0) | 93.8 | 91.3 | .999 |
Change in astigmatism based on the Alpins method of vector analysis | |||
TIA | 1.48 ± 0.69 | 1.09 ± 0.60 | .027* |
SIA | 1.52 ± 0.61 | 1.37 ± 0.78 | .470 |
DV | 0.52 ± 0.23 | 0.46 ± 0.37 | .568 |
ME | 0.04 ± 0.38 | 0.28 ± 0.38 | .027* |
CI | 1.16 ± 0.52 | 1.30 ± 0.51 | .315 |
IOS | 0.47 ± 0.39 | 0.55 ± 0.54 | .591 |