condition mean min max ZT0-3 8.0304194085 7.018033893999999 9.042804923 ZT4-7 12.11381170975 10.459601044500001 13.768022375 ZT8-11 19.8910932575 15.937984655000001 23.84420186 ZT12-15 14.99655240275 11.764495295 18.2286095105 ZT16-19 10.07824224825 9.5405458315 10.615938665 ZT20-23 10.8636579325 10.57805931 11.149256555