condition mean min max ZT0-3 29.649815 29.649815 29.649815 ZT4-7 43.232995 43.232995 43.232995 ZT8-11 48.148358 48.148358 48.148358 ZT12-15 44.4563135 44.4563135 44.4563135 ZT16-19 33.6319165 33.6319165 33.6319165 ZT20-23 32.1780295 32.1780295 32.1780295