In this study we investigated the effects of birth order and gender on nonsuicidalself-injury and perceived parental support. This study’s main purposewas to challenge the current use of birth order in psychology. The studyincluded a short questionnaire assessing birth order, gender, perceived parentalsupport and non-suicidal self-injury. The questionnaire was distributed throughan online survey among young adults attending a university in a medium sizedcity in Sweden (N = 202). To explore the perceived parental support, we usedThe Social Provisions scale and non-suicidal self-injury was assessed by theDeliberate Self-harm Inventory, short 9-item scale. The results of these studiesshowed that birth order had no significant effect on non-suicidal self-injury orperceived parental support. On the other hand, the results suggested that genderhad a significant effect on non-suicidal self-injury, with females engaging onnon-suicidal injury more frequently than men. This contradicts earlier studieswhere no effect of gender has been present in young adults. Gender had noapparent effect on perceived parental support. / I denna studie undersökte vi effekten av placering i syskonskaran och kön påicke-suicidalt självskadebeteende och upplevt föräldrastöd. Denna studieshuvudsyfte var att utmana hur placeringen i syskonskaran används i psykologi.Studien inkluderade ett kortare frågeformulär som mätte placering isyskonskaran, kön, upplevt föräldrastöd och icke-suicidalt självskadebeteende.Frågeformuläret delades ut genom en online-baserad undersökning för ungavuxna som studerar på ett universitet i en medelstor svensk stad (N = 202). Föratt undersöka upplevt föräldrastöd använde vi oss av The Social Provisionsscale och icke-suicidalt självskadebeteende undersöktes av Deliberate SelfharmInventory, short 9-item scale. Resultatet av denna studie visade attplacering i syskonskaran inte hade några signifikanta effekter på varken ickesuicidaltsjälvskadebeteende eller upplevt föräldrastöd. Dock visade det sig attkön hade en effekt på icke-suicidalt självskadebeteende, då kvinnor hade enhögre prevalens att praktisera än män. Kön hade ingen uppenbar effekt påupplevt föräldrastöd.

The purpose of this study was to explore the association between problematic social media use (PSMU) and self-rated health (SRH) among Swedish adolescent boys and girls, and additionally to examine whether perceived familial social support buffers against poor health in the same association. The study was based on the Health Behaviour in School-aged Children (HBSC) survey from 2017/2018. The study sample consisted of 3371 adolescents from 213 schools across Sweden. PSMU was used as the exposure variable, SRH as theoutcome variable, age and gender as control variables, and perceived familial social support was applied as a moderator between PSMU and SRH. The analyses performed in the current study was cross-tabulations, binary logistic regression, multiplicative and additive interaction analysis. The results revealed that there is a significant association between PSMU and SRHamong Swedish adolescents. Adolescents with moderate level PSMU had 2.77 higher odds of reporting less than good health (95% CI 2.00-3.84) in comparison to adolescents with low levels of PSMU. Adolescents with high level PSMU had furthermore 4.16 odds of reporting less than good health PSMU (95% CI 2.41-7.20) in comparison to adolescents with low levelPSMU. The association between PSMU and SRH remained statistically significant even after adjusting for age, gender, and perceived familial social support. The interaction analyses did moreover reveal that perceived familial social support may play a crucial role by mitigating the effects of high level PSMU on SRH among Swedish adolescents. In a conclusion, it is of vital importance to understand PSMU in relation to the social context to better understand PSMU and prevent young people from poor SRH. Future research may address the same association but in relation to other social factors, such as socioeconomic status, to achieveenhanced understanding over the association between PSMU and SRH and how to better prevent poor health among young people. Policy makers could furthermore introduce support programs for families/parents who feel they lack confidence in the ability to act as sufficient support, which may reduce the risk for poor health among young people.