condition mean min max ZT0-3 10.081277499999999 9.338754999999999 10.8238 ZT4-7 7.85343 7.85343 7.85343 ZT8-11 7.6183 7.6183 7.6183 ZT12-15 0 0 0 ZT16-19 16.0464 16.0464 16.0464 ZT20-23 13.28305 13.28305 13.28305