condition mean min max ZT0-3 5.178497500000001 4.90645 5.450545 ZT4-7 4.00642 4.00642 4.00642 ZT8-11 3.70675 3.70675 3.70675 ZT12-15 0 0 0 ZT16-19 4.11227 4.11227 4.11227 ZT20-23 6.01343 6.01343 6.01343