condition mean min max ZT0-3 1.95922025 1.5147305 2.4037100000000002 ZT4-7 1.728515 1.728515 1.728515 ZT8-11 1.490414 1.490414 1.490414 ZT12-15 0 0 0 ZT16-19 2.2911799999999998 2.2911799999999998 2.2911799999999998 ZT20-23 1.460235 1.460235 1.460235