condition mean min max ZT0-3 21.16435 14.96665 25.9756 ZT4-7 16.9257 16.9257 16.9257 ZT8-11 15.75415 15.75415 15.75415 ZT12-15 27.243325000000002 24.509900000000002 29.976750000000003 ZT16-19 30.58995 30.58995 30.58995 ZT20-23 29.80685 29.80685 29.80685