condition mean min max ZT0-3 4.19984 2.4972399999999997 6.915044999999999 ZT4-7 2.65267 2.65267 2.65267 ZT8-11 1.6298499999999998 1.6298499999999998 1.6298499999999998 ZT12-15 3.6274974999999996 2.794635 4.46036 ZT16-19 1.7001775000000001 1.7001775000000001 1.7001775000000001 ZT20-23 1.9163199999999998 1.9163199999999998 1.9163199999999998