condition mean min max ZT0-3 9.634885 8.87204 10.39773 ZT4-7 7.8504000000000005 7.8504000000000005 7.8504000000000005 ZT8-11 6.599475 6.599475 6.599475 ZT12-15 0 0 0 ZT16-19 11.68205 11.68205 11.68205 ZT20-23 10.779655 10.779655 10.779655