condition mean min max ZT0-3 2.5880590289999996 2.030273435 3.1458446229999995 ZT4-7 2.53720147325 2.0378506145 3.0365523320000003 ZT8-11 5.0858146067500005 4.190468529 5.981160684500001 ZT12-15 4.74273486925 4.002502918 5.4829668205 ZT16-19 4.0765215455 3.0613262535 5.0917168375 ZT20-23 9.597732501749999 7.503226833499999 11.69223817