condition mean min max ZT0-3 21.617619187499997 14.881809324999999 28.35342905 ZT4-7 20.040165594999998 19.185293665 20.895037525 ZT8-11 16.823519920000003 16.475946450000002 17.17109339 ZT12-15 11.101804597000001 10.001285979 12.202323215 ZT16-19 13.164498219999999 12.183199389999999 14.145797049999999 ZT20-23 17.47806975 16.799495725 18.156643775