The phrase "a combination of unfavourable" is correct and usable in written English.
It can be used when describing a situation or outcome that results from multiple negative factors or elements.
Example: "The project's failure was due to a combination of unfavourable market conditions and poor management decisions."
Alternatives: "a mix of adverse" or "a blend of negative".
We propose that the apparent contradiction between superior nutrient conditions and inferior plant food quality on heuweltjies is caused by a combination of otherwise unfavourable soil properties and historic overgrazing of heuweltjies resulting in local degradation of the vegetation.
Given that in our population 25% of cases had a combination of those unfavourable genotypes, this means that a non negligible proportion of gastric cancer cases would have never developed if those enzymatic activities were adequate.
In such environments, plant species have to deal with a harsh combination of unfavourable factors including a long period of aridity, which leads to extremely low air humidity, a high proportion of short-wave radiation, low atmospheric pressure and year-round frosts (Körner 2003).
Although he produced several excellent designs during the 1930s and '40s, a combination of bad luck, unfavourable wartime government decisions, and internal politics dogged his creations throughout this phase of his career.
Forty-seven patients received post-operative radiotherapy because of either tumour-positive lymph nodes or meeting the terms of the Sedlis criteria (Sedlis et al, 1999; a combination of two of the following unfavourable prognostic parameters: depth of infiltration⩾15 mm, tumour size⩾40 mm and presence of vasoinvasion).
Forty-seven patients received post-operative radiotherapy because of either tumour-positive lymph nodes or the presence of positive risk factors described by the Sedlis criteria (Sedlis et al, 1999; a combination of two of the following unfavourable prognostic parameters: depth of infiltration ⩾15 mm (deep stromal invasion; middle or deep third), tumour size ⩾40 mm and presence of vasoinvasion).
In some patients, the combination of unfavourable pharyngolaryngeal anatomy and reduced apnoea time due to cardiorespiratory decompensation makes this stop-start approach hazardous.
19 21 A combination of the factors discussed does manifestly contribute to an unfavourable course of the disease among elderly patients, which gives it special significance in the context of the analysed group of patients.
After the sexual reproduction at the end of the pelagic season the medusa population collapses due to a combination of post-spawning senescence, parasite infestation, food limitation, diseases or unfavourable temperatures5,14,15.
