condition mean min max ZT0-3 41.53478833333333 8.463915 61.3554 ZT4-7 21.2919 21.2919 21.2919 ZT8-11 12.43485 12.43485 12.43485 ZT12-15 11.853355 6.33606 17.37065 ZT16-19 28.2331 28.2331 28.2331 ZT20-23 51.1362 51.1362 51.1362