condition mean min max ZT0-3 15.009 15.009 15.009 ZT4-7 19.47505 19.47505 19.47505 ZT8-11 14.6928 14.6928 14.6928 ZT12-15 14.66785 14.66785 14.66785 ZT16-19 11.69145 11.69145 11.69145 ZT20-23 12.66685 12.66685 12.66685