condition mean min max ZT0-3 5.5381500612500005 4.8111666045 6.265133518 ZT4-7 5.125321888749999 4.6226508035 5.627992974 ZT8-11 10.54982705925 7.7863665934999995 13.313287525 ZT12-15 11.517980608750001 11.174087176 11.8618740415 ZT16-19 6.9359684685000005 6.635531826 7.236405111 ZT20-23 7.3359569035000005 6.7392204365 7.932693370500001