Are there any independent studies that can help me evaluate the quality of different mattresses?

People who sleep on their side with shoulder or upper back pain should also consider the pressure-relieving qualities of a mattress before buying it, as poor pressure relief can cause tension in these areas. They compared a latex mattress and a traditional spring mattress in 16 healthy volunteers and evaluated the results before and after both using actigraphy and a mini-sleep questionnaire (MSQ). While several studies recognize the importance of mattresses for the quality of sleep, there is no common agreement on the optimal design of a mattress to alleviate or prevent neck or lower back pain. Questionnaire on the structural and morphological qualities of the mattress (firmness and softness).