condition mean min max ZT0-3 1253.05 1253.05 1253.05 ZT4-7 957.7 957.7 957.7 ZT8-11 864.7 864.7 864.7 ZT12-15 442.04999999999995 442.04999999999995 442.04999999999995 ZT16-19 1024.65 1024.65 1024.65 ZT20-23 1209.25 1209.25 1209.25