condition mean min max ZT0-3 11.477331 11.477331 11.477331 ZT4-7 10.364255 10.364255 10.364255 ZT8-11 10.792295 10.792295 10.792295 ZT12-15 9.4595015 9.4595015 9.4595015 ZT16-19 10.141265 10.141265 10.141265 ZT20-23 9.760535 9.760535 9.760535