condition mean min max ZT0-3 2.584165117 2.451141672 2.717188562 ZT4-7 5.006457308249999 3.9027184124999996 6.110196203999999 ZT8-11 13.63295287175 10.5005613985 16.765344345 ZT12-15 16.01274129 15.80232951 16.22315307 ZT16-19 8.76381976075 8.6540836405 8.873555881000001 ZT20-23 8.5350403795 8.2284317705 8.8416489885