condition mean min max ZT0-3 12.406134 12.406134 12.406134 ZT4-7 13.9745655 13.9745655 13.9745655 ZT8-11 13.4558805 13.4558805 13.4558805 ZT12-15 14.889171000000001 14.889171000000001 14.889171000000001 ZT16-19 12.206178999999999 12.206178999999999 12.206178999999999 ZT20-23 13.829556499999999 13.829556499999999 13.829556499999999