The phrase "are often unfavourable for" is correct and usable in written English.
It can be used when discussing conditions or situations that typically do not favor a particular outcome or group.
Example: "The economic policies implemented during the recession are often unfavourable for small businesses trying to survive."
Alternatives: "are frequently detrimental to" or "often pose challenges for".
In patients who undergone radical surgery, all these requirements are often unfavourable and zygoma implants represent a valid alternative in offering prosthetic anchorage [2, 6, 10].
The 23m-odd population is large for the country's arable land, and the weather is often unfavourable: late-summer floods in 2006 and 2007 caused widespread damage.
Similar to other NSVP mirror profiles, the spherical mirror profile is often unfavourable in various applications that require mapping between an image point and its corresponding unwrapped counterpart due to the lacking of a practical solution for SVP formation.
The need for private investments to meet this target is evident, but small-scale electrification projects are often unattractive for private investors due to unfavourable risk-return profiles and small investment volumes.
Local gas pipelines provide a valuable resource to urban areas and are often forced to cover unfavourable ground conditions in order to form a serviceable network.
Part-time workers are often seen as peripheral workers and are given unfavourable working times [28].
However this treatment is often responsible for colour alterations, development of off-flavours and unfavourable texture changes.
Carol fights in her hijab too the only professional fighter in Australia to do so and she contends it would be easier for her to remove her veil, considering she is often met with unfavourable reactions from members of the crowd as she enters the ring.
Although potentially useful landraces can now be identified, their use in breeding is often hindered by unfavourable linkages.
