The overall QALY loss using the four stage approach or the two stage approach, the standard deviation of the mean overall QALY loss is shown in brackets.

The overall QALY loss using the four stage approach or the two stage approach, the standard deviation of the mean overall QALY loss is shown in brackets.采用四阶段法（four stage approach）或两阶段法（two stage approach）所得的总体质量调整生命年（Quality Adjusted Life Years, QALY）损失，其平均总体QALY损失的标准差已标注于括号中。