condition mean min max ZT0-3 17.18355 14.9598 19.4073 ZT4-7 13.08765 13.08765 13.08765 ZT8-11 23.0929 23.0929 23.0929 ZT12-15 0 0 0 ZT16-19 14.780450000000002 14.780450000000002 14.780450000000002 ZT20-23 15.763349999999999 15.763349999999999 15.763349999999999