condition mean min max ZT0-3 10.635196 10.635196 10.635196 ZT4-7 11.9168675 11.9168675 11.9168675 ZT8-11 14.5263155 14.5263155 14.5263155 ZT12-15 13.8495425 13.8495425 13.8495425 ZT16-19 15.264226999999998 15.264226999999998 15.264226999999998 ZT20-23 13.685978500000001 13.685978500000001 13.685978500000001