condition mean min max ZT0-3 0.6649536666666667 0.3710485 0.820856 ZT4-7 0.4346925 0.4346925 0.4346925 ZT8-11 0.8096445 0.8096445 0.8096445 ZT12-15 1.350555 1.079065 1.622045 ZT16-19 1.330518 1.330518 1.330518 ZT20-23 0.5586235 0.5586235 0.5586235