condition mean min max ZT0-3 7.30643947375 6.5431740755000005 8.069704872 ZT4-7 5.184615050250001 4.8121527875000005 5.557077313000001 ZT8-11 5.7950290102499995 4.8504133419999995 6.7396446785 ZT12-15 4.67452772075 4.45239516 4.8966602815 ZT16-19 4.701716917000001 3.903466978 5.499966856 ZT20-23 6.74155417225 6.387812327 7.0952960175