condition mean min max ZT0-3 23.8716 23.8716 23.8716 ZT4-7 16.65935 16.65935 16.65935 ZT8-11 11.62425 11.62425 11.62425 ZT12-15 13.79555 13.79555 13.79555 ZT16-19 20.050849999999997 20.050849999999997 20.050849999999997 ZT20-23 23.4568 23.4568 23.4568