condition mean min max ZT0-3 19.880892 19.880892 19.880892 ZT4-7 35.384702499999996 35.384702499999996 35.384702499999996 ZT8-11 55.2193725 55.2193725 55.2193725 ZT12-15 55.150383 55.150383 55.150383 ZT16-19 29.6945025 29.6945025 29.6945025 ZT20-23 22.84797 22.84797 22.84797