condition mean min max ZT0-3 256.4803333333333 187.059 305.51 ZT4-7 203.35500000000002 203.35500000000002 203.35500000000002 ZT8-11 157.54399999999998 157.54399999999998 157.54399999999998 ZT12-15 241.23575 222.31650000000002 260.155 ZT16-19 243.157 243.157 243.157 ZT20-23 266.988 266.988 266.988