condition mean min max ZT0-3 3.1281725000000002 3.1014600000000003 3.154885 ZT4-7 7.2548699999999995 7.2548699999999995 7.2548699999999995 ZT8-11 13.186499999999999 13.186499999999999 13.186499999999999 ZT12-15 0 0 0 ZT16-19 16.85575 16.85575 16.85575 ZT20-23 10.16945 10.16945 10.16945