condition mean min max ZT0-3 18.5937102095 6.629551909 30.55786851 ZT4-7 7.2002741312500005 6.6635001215 7.737048141000001 ZT8-11 11.44198587125 9.0603703015 13.823601441000001 ZT12-15 14.27631789 13.374281055 15.178354724999998 ZT16-19 15.720639437500001 13.689888755 17.75139012 ZT20-23 23.9702321675 21.635184955 26.30527938