condition mean min max ZT0-3 22.6309 22.6309 22.6309 ZT4-7 26.960295 26.960295 26.960295 ZT8-11 33.295002 33.295002 33.295002 ZT12-15 31.058257500000003 31.058257500000003 31.058257500000003 ZT16-19 25.086824999999997 25.086824999999997 25.086824999999997 ZT20-23 20.3733945 20.3733945 20.3733945