condition mean min max ZT0-3 12.150951666666666 8.293405 15.9714 ZT4-7 27.23605 27.23605 27.23605 ZT8-11 19.0686 19.0686 19.0686 ZT12-15 24.093375 18.424 29.76275 ZT16-19 29.0603 29.0603 29.0603 ZT20-23 22.423949999999998 22.423949999999998 22.423949999999998