Assessment for postnasal drip
All patients answered a series of self-answered yes/no questions regarding postnasal drip. The patients were asked if they had experienced symptoms of feeling drip in the throat, fullness in the nasopharynx, hawking or intermittent cough and if they were bothersome. PND is define as presence of at least one PND symptoms AND the patient indicated it as bothersome. Those with these criteria were grouped as “rhinitis with PND” while those who did not fulfil these criteria were grouped as “Rhinitis only”.