Table 4.

Rate of surgical procedures during observation period (number per patient)

Procedure	CPT	BAK-free travoprost	Bimatoprost	Latanoprost
Laser trabeculoplasty1	68566	0.000	0.000	0.000
Trabeculectomy, no previous surgery2	66170	0.005	0.024	0.010
Trabeculectomy, previous surgery or trauma2	66172	0.015	0.007	0.004
Aqueous shunt to reservoir2	66180	0.034	0.013	0.010
Revision of aqueous shunt3	66185	0.000	0.003	0.002
Iridectomy, peripheral, for glaucoma3	66625	0.000	0.000	0.000
Iridectomy, sector, for glaucoma1	66630	0.000	0.000	0.000
Cyclophotocoagulation, transscleral2	66710*	0.005	0.003	0.006
Cyclophotocoagulation, endoscopic4	66711	0.000	0.007	0.001
Laser iridotomy2	66761	0.015	0.033	0.036
Laser iridoplasty1	66762	0.000	0.003	0.005
Total		0.074	0.093	0.078

^*Notes: In 2006, this included 66711;

¹none performed;

²not significantly different across treatment groups;

³no significant difference between bimatoprost and latanoprost; comparison with BAK-free travoprost could not be performed due to sample size;

⁴rate significantly lower for latanoprost than bimatoprost, BAK-free travoprost rate similar to bimatoprost.

Abbreviations: BAK, benzalkonium chloride, CPT, Current Procedural Terminology.