condition mean min max ZT0-3 114.37052944333334 101.58554631999999 127.15551256666667 ZT4-7 115.30750720500001 104.67644051 125.93857390000001 ZT8-11 67.93431182333333 62.04202186333333 73.82660178333333 ZT12-15 59.060763705 58.91945595 59.20207146 ZT16-19 39.73816099 37.24853934 42.22778264 ZT20-23 35.164641368333335 32.96126219666667 37.36802054