condition mean min max ZT0-3 0.353202 0.353202 0.353202 ZT4-7 0.268245 0.268245 0.268245 ZT8-11 0.19472899999999999 0.19472899999999999 0.19472899999999999 ZT12-15 0.36980250000000003 0.36980250000000003 0.36980250000000003 ZT16-19 0.507803 0.507803 0.507803 ZT20-23 0.24209599999999998 0.24209599999999998 0.24209599999999998