condition mean min max ZT0-3 63.938836 63.938836 63.938836 ZT4-7 61.5862225 61.5862225 61.5862225 ZT8-11 72.276269 72.276269 72.276269 ZT12-15 65.111458 65.111458 65.111458 ZT16-19 66.7246045 66.7246045 66.7246045 ZT20-23 63.082495 63.082495 63.082495