condition mean min max ZT0-3 269.55 269.55 269.55 ZT4-7 241.2 241.2 241.2 ZT8-11 248.9 248.9 248.9 ZT12-15 261.79999999999995 261.79999999999995 261.79999999999995 ZT16-19 285.65 285.65 285.65 ZT20-23 325.9 325.9 325.9