condition mean min max ZT0-3 11.02597307275 9.8012508415 12.250695304 ZT4-7 14.685329800833333 10.738311975 18.632347626666665 ZT8-11 11.627154512 9.047030064000001 14.20727896 ZT12-15 10.05018492 9.437695867999999 10.662673972 ZT16-19 9.304117213833333 8.222490262333332 10.385744165333334 ZT20-23 6.738431307166666 6.589262187666666 6.887600426666666