condition mean min max ZT0-3 14.813424 14.813424 14.813424 ZT4-7 38.292797 38.292797 38.292797 ZT8-11 46.5407685 46.5407685 46.5407685 ZT12-15 50.43191 50.43191 50.43191 ZT16-19 42.065567 42.065567 42.065567 ZT20-23 28.4476245 28.4476245 28.4476245