condition mean min max ZT0-3 46.603375 41.33565 51.8711 ZT4-7 33.9233 33.9233 33.9233 ZT8-11 18.9508 18.9508 18.9508 ZT12-15 0 0 0 ZT16-19 20.901899999999998 20.901899999999998 20.901899999999998 ZT20-23 29.1971 29.1971 29.1971