Table 6

Factors influencing postoperative astigmatism

Variable	Coefficient b	SE (b)	t	p Value
Diagnosis
Final statistical model derived by backwards stepwise regression following square root transformation of astigmatism (dioptres). Adjusted R² = 0.08, residual standard error = 0.61.
Variables initially entered: age, sex, diagnosis, lens status, type of procedure, rejection, other complications, other pathology, and clinic.
Keratoconus	0.0
Fuchs' dystrophy	0.14	0.10	1.35	0.18
Bullous keratatopathy	0.27	0.10	2.56	0.01
Other	0.17	0.10	1.66	0.10
Other complication
No	0.0
Yes	0.18	0.13	1.41	0.16
Clinic
A	0.0
B	0.16	0.15	1.07	0.28
C	0.44	0.22	2.05	0.04
D	0.17	0.09	1.81	0.07
E	−0.27	0.10	−2.79	0.006
Constant	1.764	0.158