condition mean min max ZT0-3 14.26055 14.26055 14.26055 ZT4-7 17.78905 17.78905 17.78905 ZT8-11 21.35295 21.35295 21.35295 ZT12-15 14.188849999999999 14.188849999999999 14.188849999999999 ZT16-19 20.903100000000002 20.903100000000002 20.903100000000002 ZT20-23 14.69425 14.69425 14.69425