condition mean min max ZT0-3 10.260950000000001 10.260950000000001 10.260950000000001 ZT4-7 8.39966 8.39966 8.39966 ZT8-11 3.5614049999999997 3.5614049999999997 3.5614049999999997 ZT12-15 6.3662 6.3662 6.3662 ZT16-19 7.359095 7.359095 7.359095 ZT20-23 9.486705 9.486705 9.486705