condition mean min max ZT0-3 1.24611575 1.1421965 1.350035 ZT4-7 1.253815 1.253815 1.253815 ZT8-11 8.32974 8.32974 8.32974 ZT12-15 0 0 0 ZT16-19 7.184995000000001 7.184995000000001 7.184995000000001 ZT20-23 4.326465 4.326465 4.326465