condition mean min max ZT0-3 0.47804477075 0.23523716100000003 0.7208523805 ZT4-7 15.261350824 7.089020683 23.433680965 ZT8-11 64.3166983975 43.18023893 85.45315786500001 ZT12-15 79.2898188425 65.872839185 92.70679849999999 ZT16-19 33.86744107 26.9527919 40.78209024 ZT20-23 13.864616034249998 9.9037585635 17.825473504999998