This variable is the sum of (WBEA11-WBEA20), where positively worded items (WBEA12, WBEA17, WBEA19) are reverse coded, and 1 is added to all responses (converting from 0-3 to 1-4 scale to match the standardized instrument scoring). For participants with 1 or 2 missing items, STAI10 is equal to the weighted average of the nonmissing items*10.