condition mean min max ZT0-3 69.168975 64.03215 74.3058 ZT4-7 56.522000000000006 56.522000000000006 56.522000000000006 ZT8-11 43.5969 43.5969 43.5969 ZT12-15 0 0 0 ZT16-19 69.86755 69.86755 69.86755 ZT20-23 60.94365 60.94365 60.94365