condition mean min max ZT0-3 16.97211 16.97211 16.97211 ZT4-7 16.6481135 16.6481135 16.6481135 ZT8-11 18.745981 18.745981 18.745981 ZT12-15 15.015762 15.015762 15.015762 ZT16-19 15.990567 15.990567 15.990567 ZT20-23 17.6986415 17.6986415 17.6986415