Study of the Efficacy and Safety of MK-0476 in Japanese Pediatric Participants With Seasonal Allergic Rhinitis (MK-0476-519)

The TNSS is the sum of the three nasal symptom scores for nasal congestion, nasal discharge and sneezing. Participants completed a questionnaire about their nasal symptoms. Score ranged from 0 to 4 for each of the three nasal symptoms, with a total possible score ranging from 0 to 12 and a higher score indicating more severe nasal symptoms. The baseline TNSS was assessed on Day 7 of a treatment period prior to entering the chamber room. The post-baseline TNSS was assessed on Day 7 of a treatment period during 3 hours of exposure to Japanes cedar (JC) pollen in the chamber room, as an average of measurements at 30, 60, 90, 120, 150 and 180 minutes. Analysis was done by study drug as taken.

An adverse event is defined as any unfavorable and unintended change in the structure, function, or chemistry of the body temporally associated with the use of the study drug, whether or not considered related to the use of the product. Participants were monitored for occurrence adverse events for up to 14 days after last dose of study drug. Analysis was done by study drug as taken.

TNSS was weighted as 2:1:1 for nasal congestion, nasal discharge and sneezing. The Weighted TNSS ranged from 0 to 16, with a higher score indicating more severe weighted total nasal symptoms. The baseline Weighted TNSS was assessed on Day 7 of a treatment period prior to entering the chamber room. The post-baseline TNSS was assessed on Day 7 of a treatment period during 3 hours of exposure to JC pollen in the chamber room, as an average of measurements at 30, 60, 90, 120, 150 and 180 minutes. Analysis was done by study drug as taken.

The Nasal Congestion Score was assessed as 0 = No symptoms of nasal congestion to 4 = Completely obstructed all day, with a possible Nasal Congestion Score ranging from 0 to 4 and a higher score indicating more severe nasal congestion. The baseline Nasal Congestion Score was assessed on Day 7 of a treatment period prior to entering the chamber room. The post-baseline Nasal Congestion Score was assessed on Day 7 of a treatment period during 3 hours of exposure to JC pollen in the chamber room, as an average of measurements at 30, 60, 90, 120, 150 and 180 minutes. Analysis was done by study drug as taken.

The Nasal Discharge Score was assessed as 0 = 0 times participant blew his/her nose to 4 = 21 or more times participant blew his/her nose, with a possible Nasal Discharge Score ranging from 0 to 4 and a higher score indicating more severe nasal discharge. The baseline Nasal Discharge Score was assessed on Day 7 of a treatment period prior to entering the chamber room. The post-baseline Nasal Discharge Score was assessed on Day 7 of a treatment period during 3 hours of exposure to JC pollen in the chamber room, as an average of measurements at 30, 60, 90, 120, 150 and 180 minutes. Analysis was done by study drug as taken.

The Sneezing Score was assessed as 0 = 0 times participant sneezed to 4 = 21 or more times participant sneezed, with a possible Sneezing Score ranging from 0 to 4 and a higher score indicating more severe sneezing. The baseline Sneezing Score was assessed on Day 7 of a treatment period prior to entering the chamber room. The post-baseline Sneezing Score was assessed on Day 7 of a treatment period during 3 hours of exposure to JC pollen in the chamber room, as an average of measurements at 30, 60, 90, 120, 150 and 180 minutes. Analysis was done by study drug as taken.

The TNSS is the sum of the three nasal symptom scores for nasal congestion, nasal discharge and sneezing. The possible TNSS ranged from 0 to 12, with a higher score indicting more severe total nasal symptoms. The baseline TNSS was assessed on Day 7 of a treatment period prior to entering the chamber room. The post-baseline TNSS was assessed on Day 7 of a treatment period at 30, 60, 90, 120, 150 and 180 minutes after entering the chamber room. Analysis was done by study drug as taken.

TNSS was weighted as 2:1:1 for nasal congestion, nasal discharge and sneezing. The possible Weighted TNSS ranged from 0 to 16, with a higher score indicating more severe total nasal symptoms. The baseline TNSS was assessed on Day 7 of a treatment period prior to entering the chamber room. The post-baseline Weighted TNSS was assessed on Day 7 of a treatment period at 30, 60, 90, 120, 150 and 180 minutes after entering the chamber room. Analysis was done by study drug as taken.

The Nasal Congestion Score was assessed as 0 = No symptoms of nasal congestion to 4 = Completely obstructed all day. The possible Nasal Congestion Score ranged from 0 to 4, with a higher score indicating more severe nasal congestion.The Nasal Congestion Score was assessed on Day 7 prior to entering the chamber room and at 30, 60, 90, 120, 150 and 180 minutes after entering the chamber room. Analysis was done by study drug as taken.

The Nasal Discharge Score was assessed as 0 = 0 times participant blew his/her nose to 4 = 21 or more times participant blew his/her nose. The possible Nasal Discharge Score ranged from 0 to 4, with a higher score indicating more severe nasal discharge.The Nasal Discharge Score was assessed on Day 7 prior to entering the chamber room and at 30, 60, 90, 120, 150 and 180 minutes after entering the chamber room. Analysis was done by study drug as taken.

The Sneezing Score was assessed as 0 = 0 times participant sneezed to 4 = 21 or more times participant sneezed. The possible Sneezing Score ranged from 0 to 4, with a higher score indicating more severe sneezing. The Sneezing Score was assessed on Day 7 prior to entering the chamber room and at 30, 60, 90, 120, 150 and 180 minutes after entering the chamber room. Analysis was done by study drug as taken.