condition mean min max ZT0-3 38.5076 38.5076 38.5076 ZT4-7 27.6885 27.6885 27.6885 ZT8-11 41.806 41.806 41.806 ZT12-15 43.355199999999996 43.355199999999996 43.355199999999996 ZT16-19 49.26345 49.26345 49.26345 ZT20-23 37.8786 37.8786 37.8786