condition mean min max ZT0-3 1340.412817 1340.412817 1340.412817 ZT4-7 1428.6483915 1428.6483915 1428.6483915 ZT8-11 1180.703786 1180.703786 1180.703786 ZT12-15 1199.61327 1199.61327 1199.61327 ZT16-19 1052.7838000000002 1052.7838000000002 1052.7838000000002 ZT20-23 1161.7186505 1161.7186505 1161.7186505