"greatest deterioration" is correct and usable in written English.
You can use it to refer to the most severe decline in something. For example, "The city experienced its greatest deterioration when the economy declined."
One of those less conventional measures, the Mandis Agony Index, which tracks levels of distress at Britain's 100,000 largest companies, showed its greatest deterioration in November since the autumn of 1998.
Alterations in mobility, daily activities and personal care exhibited the greatest deterioration.
The greatest deterioration occurred in mortars made with CEMI blended with 10% limestone filler.
Respondents who worsened on the SDQ showed the greatest deterioration, particularly on Psychological well-being (ES = -0.81).
Zhijian [ 15] also found that the greatest deterioration in OHRQoL occurs in the early phase of treatment; the detrimental effects on OHRQoL are reduced with ongoing treatment.
The SF-36 subscales showing the greatest deterioration for a weight gain ≥ 5% were Mental Health and Vitality (with effect sizes of -0.82, and -0.63 respectively).
Thus, the domains of HRQoL and functioning with the greatest deficits at baseline tended to exhibit both the greatest improvements during LDX treatment and the greatest deteriorations following LDX withdrawal.
The overall results of this study are in agreement with previous studies [ 13- 21], that aging has a significant deteriorating effect on vibration sensibility, and that greater deterioration is observed on the proximal sites tested.
This could lead to progressively more eating of western diet based on progressively greater deterioration of hippocampal function.
Although they achieve a high performance initially, a great deterioration occurs soon.
There is no great deterioration there, no great turn as we saw at Trent Bridge and Lord's.
