This trial was an open-label and included assessments of safety, clinical efficacy, and Factor VIII (FVIII) recovery in Chinese subjects with hemophilia A. Subjects received on-demand treatments with Xyntha over a 6-month (calendar day) period.

Xyntha for on-demand treatment of bleeding episodes were according to investigator prescription during the 6 months observation period. The recovery assessed by determining the Factor VIII (FVIII) concentration (FVIII:C) levels in individual subjects at the initial and final visits. The dose of Xyntha for recovery assessments is: single 50 IU/kg (±5 IU/kg) IV bolus infusion. All Xyntha administrations occurred in the clinic (hospital).

The Investigator Hemostatic Efficacy Assessment was based on a 4-point rating scale (Excellent = 1: definite pain relief or improvement in signs of bleeding, with no additional infusion, Good = 2: definite pain relief or improvement in signs of bleeding, Moderate = 3: probable or slight improvement, No Response = 4: no improvement at all between infusions).

The Investigator Hemostatic Efficacy Assessment was based on a 4-point rating scale (Excellent = 1: definite pain relief or improvement in signs of bleeding, with no additional infusion, Good = 2: definite pain relief or improvement in signs of bleeding, Moderate = 3: probable or slight improvement, No Response = 4: no improvement at all between infusions).

Incidence of FVIII inhibitor was defined as any result determined as positive at local laboratory, and confirmed at central laboratory. Incidence was stratified by participant exposure history: Minimally Treated Patients (MTPs): those who had received at least 1 prior FVIII infusion, and <= 100 documented Exposure Days (EDs), while Previously Treated Patients (PTPs): those who had received >100 documented prior EDs. When number of prior EDs for an individual was not known to be at least 100, participants were included in the MTP population.

FVIII recovery was assessed by evaluating the change in FVIII concentration at 6 months compared to baseline.

The mean frequency of Xyntha infusions per hemorrhage was calculated as total number of injections throughout the study divided by total number of hemorrhagic events.

Participants received on-demand treatments with Xyntha (which occurred each time a participant experienced bleeding episode during the active phase of the study) according to investigator's prescription over a 6-month (calendar day) period. A single 50 International Unit (IU)/kg (+/-5 IU/kg) intravenous (IV) bolus infusion of Xyntha was given for recovery assessments.

The Investigator Hemostatic Efficacy Assessment was based on a 4-point rating scale (Excellent = 1: definite pain relief or improvement in signs of bleeding, with no additional infusion, Good = 2: definite pain relief or improvement in signs of bleeding, Moderate = 3: probable or slight improvement, No Response = 4: no improvement at all between infusions).

The Full Analysis Set (FAS) consisted of all participants who were treated and had at least 1 evaluable efficacy assessment after treatment.

Participants received on-demand treatments with Xyntha (which occurred each time a participant experienced bleeding episode during the active phase of the study) according to investigator's prescription over a 6-month (calendar day) period. A single 50 International Unit (IU)/kg (+/-5 IU/kg) intravenous (IV) bolus infusion of Xyntha was given for recovery assessments.