Percentage of participants who developed clinically significant FVIII inhibitors: those persistent over a defined period with clinically impactful effects like breakthrough bleed, low recovery, etc., during the course of the study.

Analysis set included all participants who had received at least 1 dose of ReFacto AF and those were observed for clinically significant FVIII inhibitors.

Annualized bleeding rate was calculated as the number of bleeds divided by the treatment interval duration (enrollment visit to final visit) and then multiplied by 365.25. If there was more than 1 bleed location (like ankle and joint) with identical bleed start date and time, it was treated as 1 bleed occurrence.

Efficacy analysis set included all participants who had received at least 1 dose of ReFacto AF.

Number of infusions of Refacto AF required to treat a new bleed were classified on basis of the response to at 4-point response scale of assessment (excellent, good, moderate and no response). Assessment was completed each time a participant experienced a new bleed requiring an 'on-demand' IV infusion. Excellent: definite pain relief and/or improvement in bleeding signs within 8 hours (hr) after infusion, no additional infusion administered; Good: definite pain relief and/or improvement in bleeding signs within 8 hr after infusion, at least 1 additional infusion administered for complete resolution or with no additional infusion administered; Moderate: probable or slight improvement starting after 8 hr following infusion, at least 1 additional infusion administered for complete resolution; No Response: no improvement at all between infusions or during 24 hr interval following infusion or condition worsen. Bleeds for which response not recorded, reported as: Data Not Recorded.

Efficacy analysis set included all participants who had received at least 1 dose of ReFacto AF.

Number of infusions of Refacto AF required for resolution of a bleeding episodes were classified on basis of the response at 4-point response scale of assessment (excellent, good, moderate and no response). Excellent: definite pain relief and/or improvement in bleeding signs within 8 hours (hr) after infusion, no additional infusion administered; Good: definite pain relief and/or improvement in bleeding signs within 8 hr after infusion, at least 1 additional infusion administered for complete resolution or with no additional infusion administered; Moderate: probable or slight improvement starting after 8 hr following infusion, at least 1 additional infusion administered for complete resolution; No Response: no improvement at all between infusions or during 24 hr interval following infusion or condition worsen. Bleeds for which response not recorded, reported as: Data Not Recorded.

Efficacy analysis set included all participants who had received at least 1 dose of ReFacto AF.

The number of breakthrough bleeds (spontaneous or traumatic) within 48 hours following a prophylaxis dose of ReFacto AF are summarized. If there was more than 1 bleed location (like ankle and joint) with identical bleed start date and time, it was treated as 1 bleed occurrence.

Efficacy analysis set included all participants who had received at least 1 dose of ReFacto AF.

Efficacy analysis set included all participants who had received at least 1 dose of ReFacto AF.

Consumption of total international units of Factor VIII per year was calculated for a participant: dividing the total consumption of factor VIII by participant's treatment interval duration (in days), then multiplying by 365.25.

Efficacy analysis set included all participants who had received at least 1 dose of ReFacto AF.

Mean dose for each participant was calculated as participant's total factor VIII consumption (in IU) divided by the number of infusions administered.

Efficacy analysis set included all participants who had received at least 1 dose of ReFacto AF.

Consumption of total international units of Factor VIII by weight was calculated for a participant: dividing the total consumption of factor VIII by participant's weight (the most recently recorded).

Efficacy analysis set included all participants who had received at least 1 dose of ReFacto AF.

Consumption of total international units of Factor VIII per year by weight was calculated for a participant: the total consumption of factor VIII divided by participant's treatment interval duration (in days), then multiplying by 365.25 and then dividing by participant's weight (the most recently recorded).

Efficacy analysis set included all participants who had received at least 1 dose of ReFacto AF.

Mean dose for each participant was calculated as participant's total factor consumption (in IU) divided by the number of infusions administered and then dividing by participant's weight (the most recently recorded).

Efficacy analysis set included all participants who had received at least 1 dose of ReFacto AF.

Efficacy analysis set included all participants who had received at least 1 dose of ReFacto AF.

Efficacy analysis set included all participants who had received at least 1 dose of ReFacto AF.

The number of participants who met the dose escalation criteria were prescribed a higher dose and/or were prescribed more frequent doses. When dose escalation was required, the specific dose and dosing schedule was at the investigator's discretion.

Efficacy analysis set consisted of all participants who had received at least 1 dose of ReFacto AF.

LETE occurs in OD setting if participant recorded 2 successive "No Response" (no improvement at all between infusions, or condition worsens) ratings after 2 successive infusions of study drug. Infusions must have been given within 24 hours (hr) of each other for treatment of same bleeding event in absence of confounding factors (known presence or subsequent identification of a FVIII inhibitor, known inadequate dose for type and/or severity of bleed in opinion of investigator, delay of greater than (>) 4 hr between onset of bleed to infusion, delay of >24 hr before administration of a follow-up infusion, known compromised study drug, faulty administration of study drug, participant had an underlying, predisposing condition responsible for bleed in opinion of investigator, ongoing trauma responsible for continued bleeding.

Efficacy analysis set included all participants who had received at least 1 dose of ReFacto AF.

LETE in prophylaxis setting if there was a spontaneous bleed within 48 hours after a regularly scheduled prophylactic dose of study drug (which was not used to treat a bleed) in the absence of confounding factors (known presence or subsequent identification of a FVIII inhibitor, known inadequate prophylactic dose [a dose less than that prescribed in participant's regimen], known lack of adherence to the prescribed prophylaxis regimen, known compromised study drug, faulty administration of study drug, participant had an underlying, predisposing condition responsible for the bleed in the opinion of the investigator, traumatic injury responsible for bleeding.

Efficacy analysis set included all participants who had received at least 1 dose of ReFacto AF.

LETE was lower than expected recovery of FVIII in the opinion of the investigator following infusion of study drug in the absence of confounding factors (known presence or subsequent identification of a FVIII inhibitor, known compromised study drug, faulty administration of study drug including inadequate dosing).

Efficacy analysis set consisted of all participants who had received at least 1 dose of ReFacto AF.