condition mean min max ZT0-3 10.08766 10.08766 10.08766 ZT4-7 5.285335 5.285335 5.285335 ZT8-11 2.260355 2.260355 2.260355 ZT12-15 7.4315 7.4315 7.4315 ZT16-19 19.4252 19.4252 19.4252 ZT20-23 14.4854 14.4854 14.4854