condition mean min max ZT0-3 31.441473 31.441473 31.441473 ZT4-7 29.2692805 29.2692805 29.2692805 ZT8-11 26.478011000000002 26.478011000000002 26.478011000000002 ZT12-15 32.669949 32.669949 32.669949 ZT16-19 25.0023275 25.0023275 25.0023275 ZT20-23 31.291399 31.291399 31.291399