condition mean min max ZT0-3 91.295125 83.99185 98.5984 ZT4-7 35.2279 35.2279 35.2279 ZT8-11 10.501999999999999 10.501999999999999 10.501999999999999 ZT12-15 0 0 0 ZT16-19 20.05695 20.05695 20.05695 ZT20-23 49.12425 49.12425 49.12425