condition mean min max ZT0-3 9.795205 8.70941 10.881 ZT4-7 9.332519999999999 9.332519999999999 9.332519999999999 ZT8-11 16.7314 16.7314 16.7314 ZT12-15 0 0 0 ZT16-19 15.03055 15.03055 15.03055 ZT20-23 13.98215 13.98215 13.98215