condition mean min max ZT0-3 51.96895 51.96895 51.96895 ZT4-7 105.444 105.444 105.444 ZT8-11 36.212900000000005 36.212900000000005 36.212900000000005 ZT12-15 24.88745 24.88745 24.88745 ZT16-19 18.137999999999998 18.137999999999998 18.137999999999998 ZT20-23 29.1372 29.1372 29.1372