condition mean min max ZT0-3 9.553566 9.553566 9.553566 ZT4-7 10.042034000000001 10.042034000000001 10.042034000000001 ZT8-11 10.6183735 10.6183735 10.6183735 ZT12-15 10.763508999999999 10.763508999999999 10.763508999999999 ZT16-19 9.711131 9.711131 9.711131 ZT20-23 10.5557485 10.5557485 10.5557485