condition mean min max ZT0-3 7.3727625 7.129144999999999 7.61638 ZT4-7 8.829744999999999 8.829744999999999 8.829744999999999 ZT8-11 10.265730000000001 10.265730000000001 10.265730000000001 ZT12-15 0 0 0 ZT16-19 8.274035 8.274035 8.274035 ZT20-23 7.3027500000000005 7.3027500000000005 7.3027500000000005