condition mean min max ZT0-3 57.8598 34.098299999999995 77.70485 ZT4-7 63.203599999999994 63.203599999999994 63.203599999999994 ZT8-11 27.0441 27.0441 27.0441 ZT12-15 31.923175 30.79365 33.0527 ZT16-19 35.280100000000004 35.280100000000004 35.280100000000004 ZT20-23 38.85265 38.85265 38.85265