condition mean min max ZT0-3 34.75 34.75 34.75 ZT4-7 55.5 55.5 55.5 ZT8-11 30.049999999999997 30.049999999999997 30.049999999999997 ZT12-15 38.6 38.6 38.6 ZT16-19 55.4 55.4 55.4 ZT20-23 31.849999999999998 31.849999999999998 31.849999999999998