condition mean min max ZT0-3 47.846424999999996 46.2003 49.49255 ZT4-7 51.5409 51.5409 51.5409 ZT8-11 53.7321 53.7321 53.7321 ZT12-15 0 0 0 ZT16-19 55.496300000000005 55.496300000000005 55.496300000000005 ZT20-23 70.79645 70.79645 70.79645