condition mean min max ZT0-3 1315.968414 1315.968414 1315.968414 ZT4-7 2279.1910319999997 2279.1910319999997 2279.1910319999997 ZT8-11 1686.8811824999998 1686.8811824999998 1686.8811824999998 ZT12-15 1405.6464485000001 1405.6464485000001 1405.6464485000001 ZT16-19 939.968022 939.968022 939.968022 ZT20-23 1011.990247 1011.990247 1011.990247