condition mean min max ZT0-3 150.650093 150.650093 150.650093 ZT4-7 178.527229 178.527229 178.527229 ZT8-11 162.1814745 162.1814745 162.1814745 ZT12-15 145.38982 145.38982 145.38982 ZT16-19 132.567789 132.567789 132.567789 ZT20-23 140.945595 140.945595 140.945595