condition mean min max ZT0-3 6.51332 4.96566 7.791885000000001 ZT4-7 4.40423 4.40423 4.40423 ZT8-11 4.85764 4.85764 4.85764 ZT12-15 11.472535 11.02722 11.917850000000001 ZT16-19 10.9953 10.9953 10.9953 ZT20-23 13.501000000000001 13.501000000000001 13.501000000000001