condition mean min max ZT0-3 41.785589 41.785589 41.785589 ZT4-7 94.43448 94.43448 94.43448 ZT8-11 100.10734450000001 100.10734450000001 100.10734450000001 ZT12-15 69.2346775 69.2346775 69.2346775 ZT16-19 54.555020999999996 54.555020999999996 54.555020999999996 ZT20-23 35.378975 35.378975 35.378975