condition mean min max ZT0-3 10.565865 10.565865 10.565865 ZT4-7 9.959128 9.959128 9.959128 ZT8-11 10.480069499999999 10.480069499999999 10.480069499999999 ZT12-15 10.769563999999999 10.769563999999999 10.769563999999999 ZT16-19 11.76272 11.76272 11.76272 ZT20-23 9.741943 9.741943 9.741943