condition mean min max ZT0-3 46.84725 46.7277 46.9668 ZT4-7 41.60405 41.60405 41.60405 ZT8-11 49.570049999999995 49.570049999999995 49.570049999999995 ZT12-15 0 0 0 ZT16-19 52.887699999999995 52.887699999999995 52.887699999999995 ZT20-23 51.10955 51.10955 51.10955