condition mean min max ZT0-3 1.052489 1.0101805000000001 1.0947975 ZT4-7 2.077675 2.077675 2.077675 ZT8-11 1.2961175 1.2961175 1.2961175 ZT12-15 0 0 0 ZT16-19 1.614425 1.614425 1.614425 ZT20-23 2.30165 2.30165 2.30165