condition mean min max ZT0-3 285.882193 285.882193 285.882193 ZT4-7 297.9931555 297.9931555 297.9931555 ZT8-11 285.38679049999996 285.38679049999996 285.38679049999996 ZT12-15 333.92340149999995 333.92340149999995 333.92340149999995 ZT16-19 243.3474415 243.3474415 243.3474415 ZT20-23 201.35535700000003 201.35535700000003 201.35535700000003