condition mean min max ZT0-3 45.357325 41.61575 49.0989 ZT4-7 59.92659999999999 59.92659999999999 59.92659999999999 ZT8-11 32.3407 32.3407 32.3407 ZT12-15 0 0 0 ZT16-19 32.331450000000004 32.331450000000004 32.331450000000004 ZT20-23 43.5557 43.5557 43.5557