condition mean min max ZT0-3 11.651417 11.651417 11.651417 ZT4-7 11.555678499999999 11.555678499999999 11.555678499999999 ZT8-11 9.643851 9.643851 9.643851 ZT12-15 10.308883 10.308883 10.308883 ZT16-19 10.283783 10.283783 10.283783 ZT20-23 9.792548 9.792548 9.792548