condition mean min max ZT0-3 14.577886 14.577886 14.577886 ZT4-7 12.407347999999999 12.407347999999999 12.407347999999999 ZT8-11 10.7699645 10.7699645 10.7699645 ZT12-15 14.9877355 14.9877355 14.9877355 ZT16-19 10.350046500000001 10.350046500000001 10.350046500000001 ZT20-23 13.4045665 13.4045665 13.4045665