condition mean min max ZT0-3 27.063100000000002 27.063100000000002 27.063100000000002 ZT4-7 17.7117 17.7117 17.7117 ZT8-11 24.080399999999997 24.080399999999997 24.080399999999997 ZT12-15 22.3397 22.3397 22.3397 ZT16-19 36.74915 36.74915 36.74915 ZT20-23 27.830350000000003 27.830350000000003 27.830350000000003