condition mean min max ZT0-3 145.80874999999997 142.06799999999998 149.5495 ZT4-7 136.1755 136.1755 136.1755 ZT8-11 311.0 311.0 311.0 ZT12-15 0 0 0 ZT16-19 331.00300000000004 331.00300000000004 331.00300000000004 ZT20-23 223.721 223.721 223.721