condition mean min max ZT0-3 6.521157873250001 5.0477685255 7.994547221 ZT4-7 5.084918281 4.5965380075 5.5732985545 ZT8-11 5.5480578215000005 5.2111650555 5.8849505875000006 ZT12-15 6.84155761675 6.718532723500001 6.96458251 ZT16-19 8.6133422075 7.766097742 9.460586673 ZT20-23 15.365307581249999 11.959295982499999 18.77131918