condition mean min max ZT0-3 5.1170275 3.9715249999999997 6.26253 ZT4-7 4.661815 4.661815 4.661815 ZT8-11 12.66785 12.66785 12.66785 ZT12-15 0 0 0 ZT16-19 5.92949 5.92949 5.92949 ZT20-23 3.7464649999999997 3.7464649999999997 3.7464649999999997