condition mean min max ZT0-3 683.241065 683.241065 683.241065 ZT4-7 648.3380115 648.3380115 648.3380115 ZT8-11 384.045077 384.045077 384.045077 ZT12-15 290.18165899999997 290.18165899999997 290.18165899999997 ZT16-19 334.21322150000003 334.21322150000003 334.21322150000003 ZT20-23 424.39278 424.39278 424.39278