condition mean min max ZT0-3 15.9133 15.9133 15.9133 ZT4-7 21.716 21.716 21.716 ZT8-11 8.08071 8.08071 8.08071 ZT12-15 6.531235000000001 6.531235000000001 6.531235000000001 ZT16-19 8.394955 8.394955 8.394955 ZT20-23 10.463355 10.463355 10.463355