condition mean min max ZT0-3 2.2887296355 1.5024928919999998 3.074966379 ZT4-7 6.385920883 6.0213333715 6.7505083945 ZT8-11 6.6613300120000005 5.609599167 7.713060857 ZT12-15 21.392121047499998 15.81480697 26.969435125 ZT16-19 33.8654985325 31.286174645 36.44482242 ZT20-23 41.513408999999996 40.75370452 42.27311348