condition mean min max ZT0-3 14.26745 14.26745 14.26745 ZT4-7 15.85365 15.85365 15.85365 ZT8-11 9.167455 9.167455 9.167455 ZT12-15 7.97868 7.97868 7.97868 ZT16-19 8.846905 8.846905 8.846905 ZT20-23 10.7168 10.7168 10.7168