condition mean min max ZT0-3 5.333005 5.1165199999999995 5.54949 ZT4-7 4.758665000000001 4.758665000000001 4.758665000000001 ZT8-11 4.079355 4.079355 4.079355 ZT12-15 0 0 0 ZT16-19 8.003155 8.003155 8.003155 ZT20-23 6.78568 6.78568 6.78568