condition mean min max ZT0-3 0.359129 0.3091375 0.399534 ZT4-7 1.7705 1.7705 1.7705 ZT8-11 5.910605 5.910605 5.910605 ZT12-15 2.1872325 2.01239 2.362075 ZT16-19 1.71041 1.71041 1.71041 ZT20-23 0.8041134999999999 0.8041134999999999 0.8041134999999999