condition mean min max ZT0-3 1.6362904999999999 1.631205 1.641376 ZT4-7 3.300895 3.300895 3.300895 ZT8-11 3.135895 3.135895 3.135895 ZT12-15 0 0 0 ZT16-19 2.344125 2.344125 2.344125 ZT20-23 1.6545 1.6545 1.6545