condition mean min max ZT0-3 10.3855575 9.422415 11.348700000000001 ZT4-7 4.979465 4.979465 4.979465 ZT8-11 4.118225000000001 4.118225000000001 4.118225000000001 ZT12-15 0 0 0 ZT16-19 4.96457 4.96457 4.96457 ZT20-23 8.161760000000001 8.161760000000001 8.161760000000001