condition mean min max ZT0-3 79.056525 79.056525 79.056525 ZT4-7 64.805983 64.805983 64.805983 ZT8-11 56.936626000000004 56.936626000000004 56.936626000000004 ZT12-15 48.4446655 48.4446655 48.4446655 ZT16-19 53.8335345 53.8335345 53.8335345 ZT20-23 47.2726685 47.2726685 47.2726685