condition mean min max ZT0-3 4.060650000000001 4.060650000000001 4.060650000000001 ZT4-7 3.829175 3.829175 3.829175 ZT8-11 3.03001 3.03001 3.03001 ZT12-15 2.362835 2.362835 2.362835 ZT16-19 2.83379 2.83379 2.83379 ZT20-23 3.474 3.474 3.474