condition mean min max ZT0-3 53.79895 41.53335 63.423 ZT4-7 72.1211 72.1211 72.1211 ZT8-11 54.5482 54.5482 54.5482 ZT12-15 57.1142 51.43015 62.79825 ZT16-19 46.15425 46.15425 46.15425 ZT20-23 57.9588 57.9588 57.9588