condition mean min max ZT0-3 4921.822213 4921.822213 4921.822213 ZT4-7 2531.8474415 2531.8474415 2531.8474415 ZT8-11 2610.3514269999996 2610.3514269999996 2610.3514269999996 ZT12-15 2973.4574414999997 2973.4574414999997 2973.4574414999997 ZT16-19 5127.384952 5127.384952 5127.384952 ZT20-23 5769.0078495 5769.0078495 5769.0078495