condition mean min max ZT0-3 14.83264 14.83264 14.83264 ZT4-7 15.026715 15.026715 15.026715 ZT8-11 14.5248035 14.5248035 14.5248035 ZT12-15 13.844288 13.844288 13.844288 ZT16-19 16.506583 16.506583 16.506583 ZT20-23 14.535777 14.535777 14.535777