condition mean min max ZT0-3 7.992933333333334 7.220555 8.868500000000001 ZT4-7 3.51056 3.51056 3.51056 ZT8-11 3.0474949999999996 3.0474949999999996 3.0474949999999996 ZT12-15 4.7105274999999995 3.65766 5.763394999999999 ZT16-19 3.001085 3.001085 3.001085 ZT20-23 4.54973 4.54973 4.54973