condition mean min max ZT0-3 13.855503333333333 10.22051 18.00175 ZT4-7 18.56645 18.56645 18.56645 ZT8-11 19.14365 19.14365 19.14365 ZT12-15 22.138350000000003 19.01425 25.26245 ZT16-19 14.9923 14.9923 14.9923 ZT20-23 20.97735 20.97735 20.97735