condition mean min max ZT0-3 357.241804 357.241804 357.241804 ZT4-7 430.35472749999997 430.35472749999997 430.35472749999997 ZT8-11 402.5227215 402.5227215 402.5227215 ZT12-15 439.058767 439.058767 439.058767 ZT16-19 305.77887150000004 305.77887150000004 305.77887150000004 ZT20-23 306.5045605 306.5045605 306.5045605