condition mean min max ZT0-3 885.8499999999999 885.8499999999999 885.8499999999999 ZT4-7 1464.6 1464.6 1464.6 ZT8-11 1282.1999999999998 1282.1999999999998 1282.1999999999998 ZT12-15 1338.55 1338.55 1338.55 ZT16-19 1171.6999999999998 1171.6999999999998 1171.6999999999998 ZT20-23 1002.6500000000001 1002.6500000000001 1002.6500000000001