Early bleb parameters as long-term prognostic factors for surgical success: a retrospective observational study using three-dimensional anterior-segment optical coherence tomography

Table 3 P values calculated by multivariable analysis using a Cox proportional hazards model for the surgical success

Parameter	Complete success^a			Qualified success^a
Parameter	< 15 mmHg	< 18 mmHg	< 21 mmHg	< 15 mmHg	< 18 mmHg	< 21 mmHg
Width of filtration openings	–	0.0105^*	–	0.0081**	0.0134*	–
Preoperative IOP	–	0.0512	–	0.0157*	0.0345*	–

^aSurgical failure was defined as an IOP value ≥21 mmHg, ≥ 18 mmHg, or ≥ 15 mmHg with (qualified success) or without (complete success) the use of topical ocular hypotensive medication(s). Complete failure was defined as additional glaucoma surgeries required, hypotony less than 4 mmHg and visual loss. Parameters which had potential to be prognostic factor by univariable analysis (P < 0.10) were examined. IOP intraocular pressure. *P < 0.05, **P < 0.01

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