condition mean min max ZT0-3 3.98141 3.1536 4.80922 ZT4-7 4.00145 4.00145 4.00145 ZT8-11 2.943815 2.943815 2.943815 ZT12-15 0 0 0 ZT16-19 4.990505000000001 4.990505000000001 4.990505000000001 ZT20-23 5.5679 5.5679 5.5679