condition mean min max ZT0-3 0.7456445 0.7456445 0.7456445 ZT4-7 0.7198515 0.7198515 0.7198515 ZT8-11 0.169682 0.169682 0.169682 ZT12-15 0.3966675 0.3966675 0.3966675 ZT16-19 0.25287 0.25287 0.25287 ZT20-23 1.0429724999999999 1.0429724999999999 1.0429724999999999