condition mean min max ZT0-3 6.637734999999999 6.637734999999999 6.637734999999999 ZT4-7 4.042400000000001 4.042400000000001 4.042400000000001 ZT8-11 2.185015 2.185015 2.185015 ZT12-15 3.452255 3.452255 3.452255 ZT16-19 6.27209 6.27209 6.27209 ZT20-23 9.067910000000001 9.067910000000001 9.067910000000001