condition mean min max ZT0-3 7.6488375 7.57258 7.725095 ZT4-7 5.37948 5.37948 5.37948 ZT8-11 4.5935749999999995 4.5935749999999995 4.5935749999999995 ZT12-15 0 0 0 ZT16-19 8.96782 8.96782 8.96782 ZT20-23 7.931725 7.931725 7.931725