condition mean min max ZT0-3 36.656925 36.197 37.11685 ZT4-7 31.687150000000003 31.687150000000003 31.687150000000003 ZT8-11 34.95875 34.95875 34.95875 ZT12-15 0 0 0 ZT16-19 45.432900000000004 45.432900000000004 45.432900000000004 ZT20-23 42.08265 42.08265 42.08265