In the study  that evaluated the efficacy of the TT clamp versus standard BLTR surgery, the rates of at least one unfavorable surgical outcome were 60.9% and 63.0%, respectively (adjusted odds ratio (OR) = 0.88, 95%, confidence interval (CI) 0.66-1.18).
Because the overall trichiasis recurrence rate was lower than is normally reported for trichiasis surgery in the prospective study, which utilized the posterior tarsal rotation procedure (PLTR), the authors also suggested an evaluation of the WHO recommended BLTR procedure versus the PLTR procedure .
Owing to the high concentration of reactant B and long residence time, the minimum concentration of reactant A appears in the bottom at the left side for the TLTR and TLBR and in the bottom at the right side for the BLBR and BLTR. Meanwhile, the mean concentration of reactant A in the whole space for the BLBR and BLTR is much more than that for the TLTR and TLBR as a result of reactant B being promptly discharged to the outside.
In addition, the SFOAE increases along a counterclockwise path for the BLBR and BLTR as a result of the consistent effect of the concentration distributions of reactant A, reactant B, and the reaction product.
It can be seen that the SFOAE rises rapidly in the bottom region, remains stable in the middle region, and descends in the top region for the TLTR and TLBR; it also descends in the bottom region, rises in the middle region, and remains stable in the top region for the BLBR and BLTR. Distribution of [E.sub.P] is the main reason for the above variation of the SFOAE, and the change of [E.sub.R] is relatively small, which indicates the accumulation of the reaction product has a remarkable impact in the ventilation process.
It can be seen that the rise of outdoor airflow promotes the mean SFOAE to increase for the TLTR, TLBR, and BLTR and decrease for the BLBR.
It can be found that the increase of reactant A concentration for outdoor air of ventilation at the inlet causes the mean SFOAE to rise and then descend for the TLTR but to rise for the TLBR and descend for the BLBR and BLTR. The rise of reactant A concentration for outdoor air of ventilation may bring about an increase of indoor reactant A quantity and then cause more reaction product to generate for a unit time.