condition mean min max ZT0-3 1.25055975 1.2405945 1.2605250000000001 ZT4-7 1.65537 1.65537 1.65537 ZT8-11 2.513605 2.513605 2.513605 ZT12-15 0 0 0 ZT16-19 1.33439 1.33439 1.33439 ZT20-23 1.819685 1.819685 1.819685