For these analyses, we used the total sum of all six K-SADS sleep item scores at baseline (1 3 points per item, minimum 6 points, maximum 18 points; missing answers were substituted with the average points of all items) to form a continuous measure of sleep complaints (sleep complaint severity score).
Each bucket holds the total sum of the items that are stored in that bucket and the arrival time of the oldest element stored in that bucket.
The instrument measures generalised anxiety according to severity scales by scoring the simple total sum of the items, the total score ranging from 0 to 50.
The FSFI-R total score is the sum of all the items representing each domain of sexual functioning added with the mean score of the two items assessing satisfaction.
Inter-item correlations were calculated to reveal any redundancy in measured items and corrected item-total correlations (sum of the all item scores without including the item in question) were calculated to reveal any item that could possibly belong to a different construct than the one targeted.
The total score is calculated as the sum of all the items with higher scores indicating higher disability.
Three scoring options for combining item responses in the final model were evaluated: 1) total sum of item responses, 2) dichotomous variable for each item, and 3) weighted sum of item responses.
The reliability of the total AMSTAR score between two assessors (the sum of all items answered 'yes' scored as 1, all others as 0) was (kappa 0.84 (95% CI: 0.67 to 1.00, Φ = 0.85) and Pearson's R 0.96 (95% CI: 0.92 to 0.98).
RAND-36 was analysed by using the sum of all items (total), and separate sums of physical and psychiatric items.
Each item is scored on a 4-point scale, and inattention (sum of odd-numbered items), hyperactivity-impulsivity (sum of even-numbered items), and total score (sum of all items) can be calculated.
The total CDS score is the sum of all items and ranges from 26 to 182.
