condition mean min max ZT0-3 384.923258 384.923258 384.923258 ZT4-7 244.954499 244.954499 244.954499 ZT8-11 428.7186125 428.7186125 428.7186125 ZT12-15 1174.0769675000001 1174.0769675000001 1174.0769675000001 ZT16-19 1280.701055 1280.701055 1280.701055 ZT20-23 727.25971 727.25971 727.25971