condition mean min max ZT0-3 60.73955 60.73955 60.73955 ZT4-7 51.008250000000004 51.008250000000004 51.008250000000004 ZT8-11 56.0069 56.0069 56.0069 ZT12-15 64.36625000000001 64.36625000000001 64.36625000000001 ZT16-19 68.10175000000001 68.10175000000001 68.10175000000001 ZT20-23 61.965599999999995 61.965599999999995 61.965599999999995