condition mean min max ZT0-3 2.16029 2.16029 2.16029 ZT4-7 1.13276 1.13276 1.13276 ZT8-11 0.8690995 0.8690995 0.8690995 ZT12-15 0.8209705 0.8209705 0.8209705 ZT16-19 1.6713 1.6713 1.6713 ZT20-23 1.2961 1.2961 1.2961