condition mean min max ZT0-3 235.3 235.3 235.3 ZT4-7 186.4 186.4 186.4 ZT8-11 282.75 282.75 282.75 ZT12-15 197.95 197.95 197.95 ZT16-19 219.35 219.35 219.35 ZT20-23 252.1 252.1 252.1