condition mean min max ZT0-3 24.160286 24.160286 24.160286 ZT4-7 30.446772000000003 30.446772000000003 30.446772000000003 ZT8-11 25.4120885 25.4120885 25.4120885 ZT12-15 27.2254455 27.2254455 27.2254455 ZT16-19 28.6690015 28.6690015 28.6690015 ZT20-23 29.723943 29.723943 29.723943