condition mean min max ZT0-3 1.2819375 1.273415 1.29046 ZT4-7 1.2609345 1.2609345 1.2609345 ZT8-11 2.175905 2.175905 2.175905 ZT12-15 0 0 0 ZT16-19 1.85235 1.85235 1.85235 ZT20-23 1.6066349999999998 1.6066349999999998 1.6066349999999998