condition mean min max ZT0-3 5.166885000000001 4.97998 5.35379 ZT4-7 4.884505000000001 4.884505000000001 4.884505000000001 ZT8-11 2.433305 2.433305 2.433305 ZT12-15 0 0 0 ZT16-19 2.677375 2.677375 2.677375 ZT20-23 5.969415 5.969415 5.969415