condition mean min max ZT0-3 0.7293505 0.7293505 0.7293505 ZT4-7 1.1153279999999999 1.1153279999999999 1.1153279999999999 ZT8-11 0.9072659999999999 0.9072659999999999 0.9072659999999999 ZT12-15 1.136877 1.136877 1.136877 ZT16-19 1.1434785 1.1434785 1.1434785 ZT20-23 0.8431415 0.8431415 0.8431415