condition mean min max ZT0-3 48.475183333333334 41.487449999999995 52.4583 ZT4-7 33.065799999999996 33.065799999999996 33.065799999999996 ZT8-11 29.279600000000002 29.279600000000002 29.279600000000002 ZT12-15 38.37155 38.294 38.4491 ZT16-19 33.691950000000006 33.691950000000006 33.691950000000006 ZT20-23 38.831450000000004 38.831450000000004 38.831450000000004