condition mean min max ZT0-3 5.43984 5.43984 5.43984 ZT4-7 3.648165 3.648165 3.648165 ZT8-11 3.44978 3.44978 3.44978 ZT12-15 4.42818 4.42818 4.42818 ZT16-19 7.28172 7.28172 7.28172 ZT20-23 6.712160000000001 6.712160000000001 6.712160000000001