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140 cm × 200 cm (55 in × 79 in), average double bed. 160 cm × 200 cm (63 in × 79 in), large double bed. ... another aspect to bed size is the vertical height of ...
For example, one study revealed a mean decrease of 1.54 centimetres (0.6 in) in the heights of 100 children from getting out of bed in the morning to between 4 and 5 p.m. that same day. [8] Such factors may not have been controlled in all of the following studies.
In less wealthy houses, the bed would be made of three planks and a mattress made of dried heather or fern, they would sleep with a single sheet and an old blanket. [19] In the 15th century beds became very large, reaching 7 to 8 feet (2.1 to 2.4 m) by 6 to 7 feet (1.8 to 2.1 m). The mattresses were often filled with pea-shucks, straw, or feathers.
An industry-funded 2006 study by researchers at Oklahoma State University (funded by the BSC) [34] of 59 people with poor sleep who received free new replacement mattresses for their existing mattresses 5 years or older (average age 9.5 years) found improved sleep, particularly when the existing mattresses were cheap. [35]
The average height of 19-year-old Dutch orphans in 1865 was 160 cm (5 ft 3 in). [77] From 1830 to 1857, the average height of a Dutch person decreased, even while Dutch real GNP per capita was growing at an average rate of more than 0.5% per year. The worst decline was in urban areas that in 1847, the urban height penalty was 2.5 cm (1.0 in).
Normal heights (symbol or ; SI unit metre, m) is a type of height above sea level introduced by the Soviet scientist Mikhail Molodenskii.The normal height of a point is defined as the quotient of a point's geopotential number C (i.e. its geopotential difference with that of sea level), by the vertically averaged normal gravity:
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