Calculate Patient Health Questionnaire (PHQ 4) sum score

Calculate sum score of PHQ-4

Patients are asked "Over the last 2 weeks, how often have you been bothered by any of the following problems?"

calculate_phq4_sum(phq4_1, phq4_2, phq4_3, phq4_4)

Arguments

phq4_1

vector for item "Little interest or pleasure in doing things."

phq4_2

vector for item "Feeling down, depressed, or hopeless."

phq4_3

vector for item "Feeling nervous, anxious or on edge."

phq4_4

vector for item "Not being able to stop or control worrying."

Answers need coded levels 0 = "Not at all", 1 = "Several days", 2 = "More than half the days" and 3 = "Nearly every day"

Value

A numeric vector with sum score of phq8