There was no significant difference in the overall postoperative cost -LSB- median ( interquartile range ) ; $ @ ( @ , @ ) vs. $ @ ( @ , @ ) , P = @ -RSB- , cost of follow-up visits -LSB- $ @ ( @ , @ ) vs. $ @ ( @ , @ ) , P = @ -RSB- , additional procedures -LSB- $ @ ( @ , @ ) vs. $ @ ( @ , @ ) , P = @ -RSB- , or glaucoma medication -LSB- $ @ ( @ , @ ) vs. $ @ ( @ , @ ) , P = @ -RSB- for Ex-PRESS versus trabeculectomy , respectively .