condition mean min max ZT0-3 12.7646 12.7646 12.7646 ZT4-7 12.7059 12.7059 12.7059 ZT8-11 10.51615 10.51615 10.51615 ZT12-15 12.09955 12.09955 12.09955 ZT16-19 14.4036 14.4036 14.4036 ZT20-23 13.71895 13.71895 13.71895