condition mean min max ZT0-3 5.097948333333333 3.49834 6.868555000000001 ZT4-7 7.20054 7.20054 7.20054 ZT8-11 5.52955 5.52955 5.52955 ZT12-15 4.855269999999999 3.759505 5.951034999999999 ZT16-19 4.47718 4.47718 4.47718 ZT20-23 4.15461 4.15461 4.15461