condition mean min max ZT0-3 209.745319 209.745319 209.745319 ZT4-7 176.1273845 176.1273845 176.1273845 ZT8-11 96.259453 96.259453 96.259453 ZT12-15 84.907198 84.907198 84.907198 ZT16-19 53.65325 53.65325 53.65325 ZT20-23 42.6890595 42.6890595 42.6890595