Expressed as percentage of participants who died from any cause at Day 28 endpoint.

All randomized participants with known mortality status at Day 28.

Expressed as percentage of participants who died from any cause at Day 28 endpoint. Participants with severe protein C deficiency are those who had a protein C level ≤ half the lower limit of normal (LLN) (≤40%).

All randomized participants with severe protein C deficiency at Baseline with known mortality status at Day 28.

Scores range from 0 (normal) to 4 (organ failure) with an increasing score indicating increasing cardiovascular dysfunction. A non-surviving participant receives a score of 4 (worst score) for the day of death and every day thereafter.

All randomized participants with any post-baseline data on Day 1 through Day 28. For those days when a participant is alive, but no data are available, last observation carried forward (LOFC) is used to impute the missing data. A non-surviving participant receives a score of 4 (worst score) for the day of death and every day thereafter.

Scores range from 0 (normal) to 4 (organ failure) with an increasing score indicating increasing respiratory dysfunction. A non-surviving participant receives a score of 4 (worst score) for the day of death and every day thereafter.

All randomized participants with any post-baseline data on Day 1 through Day 28. For those days when a participant is alive, but no data are available, last observation carried forward (LOFC) is used to impute the missing data. A non-surviving participant receives a score of 4 (worst score) for the day of death and every day thereafter.

Scores range from 0 (normal) to 4 (organ failure) with an increasing score indicating increasing renal dysfunction. A non-surviving participant receives a score of 4 (worst score) for the day of death and every day thereafter.

All randomized participants with any post-baseline data on Day 1 through Day 28. For those days when a participant is alive, but no data are available, last observation carried forward (LOFC) is used to impute the missing data. A non-surviving participant receives a score of 4 (worst score) for the day of death and every day thereafter.

Expressed as percentage of participants who died from any cause at Day 90 endpoint.

All randomized participants with known mortality status at Day 90.

Expressed as percentage of participants who died from any cause at Day 180 endpoint.

All randomized participants with known mortality status at Day 180.

All randomized participants excluding those with unknown mortality status at Day 180.

EQ-5D VAS assesses caregiver's impression of participant's overall health state. Scores range from 0 (worst health state) to 100 (best health state), with higher scores indicating a better health state.

All randomized participants with EQ-5D VAS data at the specified time points.

The EQ-5D is used to assess participant's overall health. Consists of 5 items: mobility, self-care, usual activities, pain/discomfort, and anxiety/depression. Each item has 3 severity levels (no, some, severe problems). Calculated from EQ-5D, total scores (United States [US] Index Score) range from 0 (worst quality of life) to 1.00 (best quality of life).

All randomized participants with EQ-5D total score data at the specified time points.

SF-12 was used as an instrument to measure participants' physical wellbeing (physical component) and mental wellbeing (mental component). Scores for each component range from 0-100, with 0= lowest wellbeing, and 100=highest wellbeing.

All randomized participants with SF-12 score data at the specified time points.

Percentage of participants who experienced serious bleeding events are reported by System Organ Class (SOC) term based on MedDRA 14.0. For a bleeding to qualify as a serious event, it would have to meet the standard definition of a serious adverse event or be a central nervous system bleeding or a bleeding event that lead to administration of ≥3 units packed red blood cells/day for 2 consecutive days.

Participants who received study drug.

Participants who received study drug.