condition mean min max ZT0-3 15.660599999999999 15.660599999999999 15.660599999999999 ZT4-7 13.78925 13.78925 13.78925 ZT8-11 12.27995 12.27995 12.27995 ZT12-15 13.670200000000001 13.670200000000001 13.670200000000001 ZT16-19 14.809899999999999 14.809899999999999 14.809899999999999 ZT20-23 15.111699999999999 15.111699999999999 15.111699999999999