condition mean min max ZT0-3 12.379634999999999 10.594919999999998 14.164349999999999 ZT4-7 6.332885 6.332885 6.332885 ZT8-11 7.6605099999999995 7.6605099999999995 7.6605099999999995 ZT12-15 0 0 0 ZT16-19 11.184149999999999 11.184149999999999 11.184149999999999 ZT20-23 11.183399999999999 11.183399999999999 11.183399999999999