condition mean min max ZT0-3 767.906391 767.906391 767.906391 ZT4-7 1278.2766634999998 1278.2766634999998 1278.2766634999998 ZT8-11 1261.185676 1261.185676 1261.185676 ZT12-15 1523.8680315 1523.8680315 1523.8680315 ZT16-19 914.205723 914.205723 914.205723 ZT20-23 567.0215065 567.0215065 567.0215065