condition mean min max ZT0-3 27.36145 27.36145 27.36145 ZT4-7 12.60785 12.60785 12.60785 ZT8-11 29.107100000000003 29.107100000000003 29.107100000000003 ZT12-15 31.5169 31.5169 31.5169 ZT16-19 38.717200000000005 38.717200000000005 38.717200000000005 ZT20-23 29.3286 29.3286 29.3286