condition mean min max ZT0-3 2.3220650000000003 1.8995950000000001 2.744535 ZT4-7 2.9412000000000003 2.9412000000000003 2.9412000000000003 ZT8-11 1.601218 1.601218 1.601218 ZT12-15 0 0 0 ZT16-19 2.731455 2.731455 2.731455 ZT20-23 2.88518 2.88518 2.88518