condition mean min max ZT0-3 1515.4 1515.4 1515.4 ZT4-7 680.7 680.7 680.7 ZT8-11 597.4000000000001 597.4000000000001 597.4000000000001 ZT12-15 815.9 815.9 815.9 ZT16-19 1308.1 1308.1 1308.1 ZT20-23 1681.35 1681.35 1681.35