condition mean min max ZT0-3 12.693674999999999 12.2563 13.13105 ZT4-7 10.7003 10.7003 10.7003 ZT8-11 10.3614 10.3614 10.3614 ZT12-15 0 0 0 ZT16-19 13.071100000000001 13.071100000000001 13.071100000000001 ZT20-23 11.3995 11.3995 11.3995