condition mean min max ZT0-3 65.45034999999999 61.791399999999996 69.10929999999999 ZT4-7 62.93485 62.93485 62.93485 ZT8-11 30.48355 30.48355 30.48355 ZT12-15 0 0 0 ZT16-19 67.8361 67.8361 67.8361 ZT20-23 77.30805000000001 77.30805000000001 77.30805000000001