condition mean min max ZT0-3 9.803605000000001 6.959315 11.341750000000001 ZT4-7 6.38722 6.38722 6.38722 ZT8-11 7.77429 7.77429 7.77429 ZT12-15 11.702404999999999 10.46661 12.9382 ZT16-19 11.1547 11.1547 11.1547 ZT20-23 12.72365 12.72365 12.72365