condition mean min max ZT0-3 44.19076666666667 42.954499999999996 45.1078 ZT4-7 43.1659 43.1659 43.1659 ZT8-11 34.098349999999996 34.098349999999996 34.098349999999996 ZT12-15 28.364150000000002 27.3932 29.3351 ZT16-19 27.6857 27.6857 27.6857 ZT20-23 35.57105 35.57105 35.57105