condition mean min max ZT0-3 39.73565 39.73565 39.73565 ZT4-7 21.7083 21.7083 21.7083 ZT8-11 30.01685 30.01685 30.01685 ZT12-15 27.9341 27.9341 27.9341 ZT16-19 49.39475 49.39475 49.39475 ZT20-23 33.7423 33.7423 33.7423