condition mean min max ZT0-3 12323.33509 12323.33509 12323.33509 ZT4-7 13552.687924999998 13552.687924999998 13552.687924999998 ZT8-11 9662.016204 9662.016204 9662.016204 ZT12-15 7009.7036035 7009.7036035 7009.7036035 ZT16-19 2179.1503915000003 2179.1503915000003 2179.1503915000003 ZT20-23 793.4110885 793.4110885 793.4110885