condition mean min max ZT0-3 8.527245 8.13183 9.29031 ZT4-7 10.4237 10.4237 10.4237 ZT8-11 7.45697 7.45697 7.45697 ZT12-15 11.77255 10.59195 12.95315 ZT16-19 11.428650000000001 11.428650000000001 11.428650000000001 ZT20-23 10.080375 10.080375 10.080375