condition mean min max ZT0-3 199.716807 199.716807 199.716807 ZT4-7 159.3690565 159.3690565 159.3690565 ZT8-11 141.38601649999998 141.38601649999998 141.38601649999998 ZT12-15 153.27249 153.27249 153.27249 ZT16-19 205.6188055 205.6188055 205.6188055 ZT20-23 216.96041200000002 216.96041200000002 216.96041200000002