Calculate BRS sum score
Patients are asked "The following questions are about your resilience to cope with crises. Please respond to each item by marking one box per row."
calculate_brs_sum(brs_1, brs_2, brs_3, brs_4, brs_5, brs_6)
vector for item "I tend to bounce back quickly after hard times.."
vector for item "I have a hard time making it through stressful events."
vector for item "It does not take me long to recover from a stressful event."
vector for item "It is hard for me to snap back when something bad happens."
vector for item "I usually come through difficult times with little trouble."
vector for item "I tend to take a long time to get over set-backs in my life."
Answers were coded /w levels "Strongly disagree", "Disagree", "Neutral", "Agree", "Strongly Agree"
A numeric vector with sum score of BRS