condition mean min max ZT0-3 10.586879 10.586879 10.586879 ZT4-7 42.953761 42.953761 42.953761 ZT8-11 89.0517405 89.0517405 89.0517405 ZT12-15 76.9769545 76.9769545 76.9769545 ZT16-19 34.837783 34.837783 34.837783 ZT20-23 14.6407305 14.6407305 14.6407305