condition mean min max ZT0-3 181.7 181.7 181.7 ZT4-7 179.1 179.1 179.1 ZT8-11 123.65 123.65 123.65 ZT12-15 197.14999999999998 197.14999999999998 197.14999999999998 ZT16-19 157.95 157.95 157.95 ZT20-23 189.5 189.5 189.5