condition mean min max ZT0-3 18.00495 18.00495 18.00495 ZT4-7 15.996300000000002 15.996300000000002 15.996300000000002 ZT8-11 15.5085 15.5085 15.5085 ZT12-15 17.6343 17.6343 17.6343 ZT16-19 19.9399 19.9399 19.9399 ZT20-23 15.668949999999999 15.668949999999999 15.668949999999999