condition mean min max ZT0-3 8.962605 6.943239999999999 10.23521 ZT4-7 9.89907 9.89907 9.89907 ZT8-11 12.631545 12.631545 12.631545 ZT12-15 14.301375 13.41965 15.1831 ZT16-19 11.0027 11.0027 11.0027 ZT20-23 10.994055 10.994055 10.994055