condition mean min max ZT0-3 15.1618 15.1618 15.1618 ZT4-7 10.41127 10.41127 10.41127 ZT8-11 6.140455 6.140455 6.140455 ZT12-15 17.02435 17.02435 17.02435 ZT16-19 29.7878 29.7878 29.7878 ZT20-23 30.4261 30.4261 30.4261