condition mean min max ZT0-3 14.058068 14.058068 14.058068 ZT4-7 16.306821499999998 16.306821499999998 16.306821499999998 ZT8-11 14.456448 14.456448 14.456448 ZT12-15 14.604729500000001 14.604729500000001 14.604729500000001 ZT16-19 14.958337499999999 14.958337499999999 14.958337499999999 ZT20-23 17.957743999999998 17.957743999999998 17.957743999999998