condition mean min max ZT0-3 22.499225 22.499225 22.499225 ZT4-7 20.6711305 20.6711305 20.6711305 ZT8-11 15.9623965 15.9623965 15.9623965 ZT12-15 62.8126065 62.8126065 62.8126065 ZT16-19 21.2270605 21.2270605 21.2270605 ZT20-23 138.247404 138.247404 138.247404