condition mean min max ZT0-3 338.586937 338.586937 338.586937 ZT4-7 243.62175 243.62175 243.62175 ZT8-11 292.5775095 292.5775095 292.5775095 ZT12-15 337.154386 337.154386 337.154386 ZT16-19 294.058997 294.058997 294.058997 ZT20-23 294.698308 294.698308 294.698308