condition mean min max ZT0-3 1.5092379999999999 1.099321 1.919155 ZT4-7 0.64669075 0.64669075 0.64669075 ZT8-11 1.1351335 1.1351335 1.1351335 ZT12-15 0 0 0 ZT16-19 1.155957 1.155957 1.155957 ZT20-23 1.23858 1.23858 1.23858