condition mean min max ZT0-3 2.5211099999999997 2.425845 2.6163749999999997 ZT4-7 6.62108 6.62108 6.62108 ZT8-11 6.684044999999999 6.684044999999999 6.684044999999999 ZT12-15 0 0 0 ZT16-19 6.514705 6.514705 6.514705 ZT20-23 6.241965 6.241965 6.241965