Table 1.

Dispersion plots of the powers of the focal photocoagulation, panretinal photocoagulation, and barrage photocoagulation groups showing non-Gaussianity of distribution

Group	FP (n = 374)	PRP (n = 666)	BP (n = 202)
Range (mW)	100 – 950	100 – 2000	125 – 1800
Mean ± SD (mW)	215.9 ± 109.9	876.1 ± 362.7	500.7 ± 264.9
95% CI for the mean	204.8 to 227.1	848.5 to 903.7	463.8 to 537.6
Median (mW)	190	800	450
95% CI for the median	175 to 200	775 to 800	400 to 495
Coefficient of Skewness	2.4 (P < 0.0001)	0.98 (P < 0.0001)	1.83 (P < 0.0001)
Coefficient of Kurtosis	10.1 (P < 0.0001)	0.38 (P = 0.0700)	4.96 (P < 0.0001)
D’Agostino-Pearson test for Normal distribution	Reject normality (P < 0.0001)	Reject normality (P < 0.0001)	Reject normality (P < 0.0001)

SD: Standard deviation, FP: Focal photocoagulation, PRP: Panretinal photocoagulation, BP: Barrage photocoagulation