condition mean min max ZT0-3 7.598891 7.598891 7.598891 ZT4-7 9.976894 9.976894 9.976894 ZT8-11 8.137881499999999 8.137881499999999 8.137881499999999 ZT12-15 8.102445 8.102445 8.102445 ZT16-19 10.0104595 10.0104595 10.0104595 ZT20-23 10.091752499999998 10.091752499999998 10.091752499999998