condition mean min max ZT0-3 13.08305 12.390450000000001 13.775649999999999 ZT4-7 15.032900000000001 15.032900000000001 15.032900000000001 ZT8-11 11.024775 11.024775 11.024775 ZT12-15 0 0 0 ZT16-19 19.326900000000002 19.326900000000002 19.326900000000002 ZT20-23 19.2742 19.2742 19.2742