condition mean min max ZT0-3 12.71285 12.3616 13.0641 ZT4-7 11.439599999999999 11.439599999999999 11.439599999999999 ZT8-11 11.778749999999999 11.778749999999999 11.778749999999999 ZT12-15 0 0 0 ZT16-19 14.866499999999998 14.866499999999998 14.866499999999998 ZT20-23 16.93335 16.93335 16.93335