Table 1. Comparison of preoperative demographic data between groups.

	Laser group (n=3289)					Manual group (n=2130)
	Subgroup A (n=250)	Subgroup B (n=250)	Subgroup C (n=250)	Subgroup D (n=2539)	Total laser group (n=3289)
Mean age (y)±SD (range)	65.63±14.68 (18-93)	65.77±12.80 (33-99)	65.49±13.17 (14-89)	66.63±12.91 (8-95)	66.40±13.07 (8-99)	66.96±12.52 (15-98)
Female sex, no. (%)	150 (60.00)	136 (54.40)	126 (50.40)	1530 (60.30)	1942 (59.05)	1204 (56.53)
Mean nuclear sclerosis±SD	2.39±0.92	2.38±0.89	2.34±0.87	2.36±0.88	2.36±0.88	2.36±0.90
Grade 1, no. (%)	42 (16.80)	37 (14.80)	35 (14.00)	380 (14.97)	494 (15.02)	365 (17.14)
Grade 2, no. (%)	97 (38.80)	110 (44.00)	121 (48.40)	1131 (44.55)	1459 (44.36)	861 (40.42)
Grade 3, no. (%)	88 (35.20)	79 (31.60)	73 (29.20)	796 (31.35)	1036 (31.50)	712 (33.43)
Grades 4 and 5, no. (%)	23 (9.20)	24 (9.60)	21 (8.40)	232 (9.14)	300 (9.12)	192 (9.01)