condition mean min max ZT0-3 52.748528 52.748528 52.748528 ZT4-7 60.749256 60.749256 60.749256 ZT8-11 72.552809 72.552809 72.552809 ZT12-15 96.448383 96.448383 96.448383 ZT16-19 79.0974195 79.0974195 79.0974195 ZT20-23 78.340303 78.340303 78.340303