condition mean min max ZT0-3 17.317835 17.317835 17.317835 ZT4-7 14.1211095 14.1211095 14.1211095 ZT8-11 14.0034405 14.0034405 14.0034405 ZT12-15 14.123846499999999 14.123846499999999 14.123846499999999 ZT16-19 16.0401335 16.0401335 16.0401335 ZT20-23 14.2201415 14.2201415 14.2201415