condition mean min max ZT0-3 2.80734 2.560635 3.054045 ZT4-7 4.29387 4.29387 4.29387 ZT8-11 4.18347 4.18347 4.18347 ZT12-15 0 0 0 ZT16-19 3.57768 3.57768 3.57768 ZT20-23 2.215465 2.215465 2.215465