Table 2 Risk of bias
Author (YR) | Level of risk of bias due to study participation | Level of risk of bias due to study attrition | Level of risk of bias due to prognostic factor measurement | Level of risk of bias due to confounding measurement and account | Level of risk of bias due to analysis | Outcome assessed | Level of risk of bias due to outcome measurement |
|---|---|---|---|---|---|---|---|
Zamir (1998) [7] | Low | N/A | Low | High | Low | Sleep fragmentation | Low |
Bloom (2002) [25] | Low | N/A | Low | Moderate | Low | CHSQ total score | Low |
SSR score | Moderate | ||||||
Palermo (2005) [26] | Low | N/A | Low | Low | Low | Sleep/Wake Behaviour Problems | Low |
Passarelli (2006) [27] | Low | N/A | Low | High | Low | Sleep disorders | Low |
Long (2008) [1] | Low | N/A | Low | Low | Low | Sleep disturbance | Low |
Ward (2008) [3] | Moderate | N/A | Low | Low | Low | Sleep disturbance | Low |
Sleep quality | Low | ||||||
Ward (2010) [28] | Moderate | N/A | Low | Low | Low | Number of wake bouts | Low |
Arousals | Low | ||||||
Apnea/Hypopnea Index (AHI) | Low | ||||||
Butbul Aviel (2011) [29] | Low | N/A | Low | Moderate | Low | CSHQ sleep disturbance | Low |
SSR sleep disturbance | Moderate | ||||||
Ward (2011) [30] | Moderate | N/A | Low | Low | Low | Total Sleep Disturbance score | Low |
Bromberg (2012) [31] | Low | Low | Low | Low | Low | Sleep quality | Low |