condition mean min max ZT0-3 83.847731 83.847731 83.847731 ZT4-7 141.491936 141.491936 141.491936 ZT8-11 177.389111 177.389111 177.389111 ZT12-15 135.972498 135.972498 135.972498 ZT16-19 135.15227850000002 135.15227850000002 135.15227850000002 ZT20-23 126.755288 126.755288 126.755288