condition mean min max ZT0-3 48.817190662499996 41.353890575 56.28049075 ZT4-7 19.5265748675 18.23809859 20.815051144999998 ZT8-11 24.285174925 18.288455820000003 30.281894029999997 ZT12-15 25.686163060000002 25.21415616 26.158169960000002 ZT16-19 29.5913314025 29.05875059 30.123912215 ZT20-23 22.9383542725 21.2703385 24.606370045