condition mean min max ZT0-3 9.716703 9.716703 9.716703 ZT4-7 8.428813 8.428813 8.428813 ZT8-11 9.5217965 9.5217965 9.5217965 ZT12-15 9.212017 9.212017 9.212017 ZT16-19 9.466248 9.466248 9.466248 ZT20-23 9.328382999999999 9.328382999999999 9.328382999999999