condition mean min max ZT0-3 7.6885175 6.683904999999999 8.69313 ZT4-7 11.578019999999999 11.578019999999999 11.578019999999999 ZT8-11 22.09966 22.09966 22.09966 ZT12-15 0 0 0 ZT16-19 11.39337 11.39337 11.39337 ZT20-23 16.22325 16.22325 16.22325