condition mean min max ZT0-3 24.723883 24.723883 24.723883 ZT4-7 38.108252 38.108252 38.108252 ZT8-11 42.486325 42.486325 42.486325 ZT12-15 32.8383625 32.8383625 32.8383625 ZT16-19 23.734113 23.734113 23.734113 ZT20-23 18.071748 18.071748 18.071748