"sparse and inconsistent" is correct and usable in written English.
You can use it to describe a situation that has gaps or lacks continuity, usually with a negative connotation. For example: "The statistics on the topic were sparse and inconsistent, making it difficult to form a reliable analysis."
The literature is both sparse and inconsistent in its description of age differences in the characteristics of constipation.
And on the new transparency report, West admits Uber struggled with the decision to publish data — saying this is "because data on safety and sexual assaults is sparse and inconsistent", and there is no uniform industry standard for reporting it.
In bipolar disorder similar mitochondrial abnormalities have been reported [9] [11], while in major depression, the current literature on MRS studies is sparse and inconsistent [12] [14].
Moreover to date data on the direct effect of nicotine on lung cancer biology is sparse and inconsistent (reviewed in [31]).
Outcomes of LYP patients treated with RT, however, have been sparse and inconsistent.
In summary then, for chronic disease, sparse and inconsistent evidence prohibits any conclusions.
Although the positive results of studies make vitamin E become an interesting option for CI-AKI prophylaxis, the sparse studies and inconsistent results cause a reluctance in using it.
However, the knowledge on the thermo-physical properties of polyols as desirable PCM for TES design is presently sparse and rather inconsistent.
Results from other cohort studies are sparse and somewhat inconsistent, and they do not represent the general population as ours do.
Nevertheless, knowledge of the intrinsic effects of ageing on atrial intracellular calcium handling in humans is lacking and data from experimental animal models are sparse and often inconsistent.
With this paper, we add to this sparse and somewhat inconsistent literature by utilizing data from a cohort study of more than 1 million Swedish men that is well characterized for IQ in late adolescence, socioeconomic position, other covariates, and cause-specific injury mortality.
