Given a passage with a context and an answer, construct a question on the basis of the information present in the passage. Construct the question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) it answer uses text phrases from the passage. Avoid creating questions that (i) can't be answered correctly without actually understanding the passage and (ii) uses the same words or phrases given in the passage.

[Q]: Context: The aim of this study was to evaluate how closely analysis of bone quality performed using the bone mineral density (BMD) values obtained by quantitative computerized tomography (QCT) reflected the histologic bone density.', "Eighteen patients requiring implant therapy underwent CT scanning. Their data were processed using Image Master software, and the BMD was calculated by measuring the Hounsfield units and relating those values to a phantom (Calibration Phantom, Quantitative Technologies). Each patient wore a radiographic-surgical template in which titanium cylinders were placed as a drilling guide for preparation of the implant site. The mouth regions where the titanium guides were placed (on the CT images and in the patient's mouth) corresponded to the implant sites where the BMD was measured and where tissue specimens for histomorphometric analysis retrieved. Forty specimens measuring 6 mm in length and 2 mm in diameter were obtained. Histomorphometric analysis was performed by digitizing the images, which were subsequently analyzed using the image analysis software IAS 2000. The bone volume (BV) was calculated as a percentage by dividing the area occupied by the mineralized bone over the entire microscopic field.", 'The results of the statistical analysis showed a Pearson correlation coefficient of 0.691 between the BV and BMD values, with a P value < 0.01, which was considered significant.
Answer: The results of this study support the use of QCT to assess the bone quality before implant placement to improve the planning of implant treatment.
[A]: Are bone mineral density and bone histomorphometry statistically related?

[Q]: Context: Studies that investigate the subjective benefit from a bone conduction implant (BCI) sound processor in patients with single-sided sensorineural deafness (SSD) have been limited to examining short- and mid-term benefit. In the current study, we performed a survey among 44 SSD BCI users with a median follow-up time of 50 months.', 'Forty-four experienced SSD BCI users participated in the survey, which consisted of the Abbreviated Profile of Hearing Aid Benefit, the Single-Sided Deafness Questionnaire, the Short Hearing Handicap Inventory for Adults, and a self-made user questionnaire. For patients with tinnitus, the Tinnitus Questionnaire was also completed. The results of the survey were correlated with contralateral hearing loss, age at implantation, duration of the hearing loss at the time of implantation, duration of BCI use, and the presence and burden of tinnitus.', 'In total, 86% of the patients still used their sound processor. The Abbreviated Profile of Hearing Aid Benefit and the Short Hearing Handicap Inventory for Adults show a statistically significant overall improvement with the BCI. The Single-Sided Deafness Questionnaire and the user questionnaire showed that almost 40% of the patients reported daily use of the sound processor. However, the survey of daily use reveals benefit only in certain circumstances. Speech understanding in noisy situations is rated rather low, and 58% of all patients reported that their BCI benefit was less than expected.
Answer: The majority of the patients reported an overall improvement from using their BCI. However, the number of users decreases during a longer follow-up time and patients get less enthusiastic about the device after an extended period of use, especially in noisy situations. However, diminished satisfaction because of time-related reductions in processor function could not be ruled out.
[A]: Do long-term subjective benefit with a bone conduction implant sound processor in 44 patients with single-sided deafness?

[Q]: Context: Anal complaints, caused not by haemorrhoids but by anal folds, fissures or perianal thrombosis, are probably too often and wrongly attributed to haemorrhoids by patients and self-treated. It was the aim of this study to find out how frequently patients with anal complaints make this false assumption and how successful their self treatment is.', "458 consecutive patients referred between May and November 2001 with unclear abdominal and/or anal symptoms were investigated by a standardized questionnaire/interview, including any experience with wet compresses, haemorrhoidal ointments or results of a doctor's treatment of haemorrhoids. They were then examined by procto-coloscopy. The findings were documented on the questionnaire and the data stored in an computer.", '344 of the 548 patients (63 %) believed that they had haemorrhoids, 184 (34 %) did not think so, and 20 (3 %) left the question unanswered. Haemorrhoids were found to be present in 18 % and 13 %, respectively. Bleeding, pain, itching and burning sensation around the anus were the most common symptoms in both groups. 151 of the 184 patients who did not think they had haemorrhoids (82 %) had been previously treated by a doctor for "haemorrhoids". 28 % of this group of patients and 36 % of those thought to have haemorrhoids had similar results with wet compresses, creams or ointments, and the two groups were also similar regarding the number found to have anal disease.
Answer: Since many patients who had wrongly thought to have haemorrhoids had "treated" them successfully with wet compresses, creams or ointments, their complaints cannot be relied upon diagnostically. Doctors should not be misled by patients' complaints into assuming the presence of haemorrhoids and treat them, because this would incur unnecessary cost and bring little success.
[A]:
Are [ Haemorrhoids too often assumed and treated . Survey of 548 patients with anal discomfort ]?