condition mean min max ZT0-3 6.62279 6.62279 6.62279 ZT4-7 5.69741 5.69741 5.69741 ZT8-11 5.987755 5.987755 5.987755 ZT12-15 6.624264999999999 6.624264999999999 6.624264999999999 ZT16-19 8.76759 8.76759 8.76759 ZT20-23 8.72193 8.72193 8.72193