condition mean min max ZT0-3 25.230825 24.716549999999998 25.7451 ZT4-7 18.810299999999998 18.810299999999998 18.810299999999998 ZT8-11 20.3968 20.3968 20.3968 ZT12-15 0 0 0 ZT16-19 28.967599999999997 28.967599999999997 28.967599999999997 ZT20-23 24.2732 24.2732 24.2732