condition mean min max ZT0-3 13.798676 13.798676 13.798676 ZT4-7 10.9240005 10.9240005 10.9240005 ZT8-11 13.6730165 13.6730165 13.6730165 ZT12-15 15.766176000000002 15.766176000000002 15.766176000000002 ZT16-19 14.142475999999998 14.142475999999998 14.142475999999998 ZT20-23 13.767506000000001 13.767506000000001 13.767506000000001