Table 5 Frequency of further (surgical) interventions and total number of appointments during 24 months of postoperative follow-up after trabeculectomy (TE) or PRESERFLO (PF) implantation

Number of 5-FU injections

82

186

 < 0.01

Number of eyes receiving 5-FU injections (total/percentage)

25

(24.04%)

52

(62.65%)

 < 0.01

Number of needlings

22

32

0.01

Number of eyes receiving needlings (total/percentage)

19

(18.27%)

28

(33.74%)

0.02

AC reformation

7

(6.73%)

4

(4.82%)

0.76

Wound suture/bleb leakage

2

(1.92%)

2

(2.41%)

1.00

Laser suture lysis

13

(12.50%)

0

 < 0.01

Releasable suture removal

1

(0.96%)

0

1.00

Revision surgery

6

8

0.41

Cataract surgery (phacoemulsification)

6

2

0.30

Secondary glaucoma surgery

4

(1 × Baerveldt tube, 1 × Ahmed tube, 2 × Cyclophotocoagulation)

4

(3xTE, 1 × Baerveldt tube)

1.00

Mean number of appointments per case

10.10 ± 3.60

9.40 ± 2.80

0.38