condition mean min max ZT0-3 10.305861666666667 6.907584999999999 13.042349999999999 ZT4-7 5.517435 5.517435 5.517435 ZT8-11 6.235165 6.235165 6.235165 ZT12-15 8.9344225 8.19557 9.673275 ZT16-19 9.29744 9.29744 9.29744 ZT20-23 10.9607 10.9607 10.9607