一歳児を育てる母親の育児力尺度の開発（2）—尺度の信頼性・妥当性の検証

Development of A Childrearing Capability Scale for Mothers Raising A One-year-old Infant And Verification of Its Credibility And Validity(2): Verification of The Scale Credibility And Validity

目的

　地域で一歳児を育てる母親の育児力を総合的に捉え、母親への的確な育児支援を行うための「一歳児を育てる母親の育児力尺度」の信頼性と妥当性を検証することである。

方法

　「一歳児を育てる母親の育児力尺度」の尺度原案として完成した9つの下位尺度と110の尺度項目を用いて、一歳児を育てる母親を対象に無記名自記式による調査を実施した。尺度の項目の選択及び決定は、尺度の下位尺度項目毎に、主成分分析後、因子分析を行いI-T相関を求め、項目を取捨選択し、下位尺度毎にクロンバックのα係数及びθ係数を算出して内的一貫性を評価した。

　妥当性の検討は、2つの外部基準を用いて基準関連妥当性の検討を行い、尺度全体の内的整合性、確認的因子分析の検討を行い、構成概念妥当性の検証を行った。

結果

　調査の有効回答数は、267人であった。一歳児を育てる母親の育児力尺度110項目は、尺度項目を精選し71項目となった。「一歳児を育てる母親の育児力尺度」の下位尺度のα係数は、0.961〜0.663であり、θ信頼係数とα係数との差は、0.001〜0.015の範囲であった。「一歳児を育てる母親の育児力尺度」と「育児に対する自己効力感尺度」、「首尾一貫感覚尺度〈SOC-13〉尺度）」の間には比較的強い相関がみられ、基準関連妥当性が確認された。「一歳児を育てる母親の育児力尺度」の尺度全体と9つの下位尺度には、比較的強い正の相関があり、9つの下位尺度は、3つのまとまりになることがわかり、尺度の構成概念妥当性が確認された。

結論

　「一歳児を育てる母親の育児力尺度」は、9つの下位尺度からなる71項目の一次元構造の尺度であり、尺度の信頼性と妥当性が確認された。

Purpose

The purpose of this study was to verify the credibility and validity of "the childrearing capability scale for mothers raising a one-year-old infant(CC Scale)", in order to comprehensively capture their childrearing capability and, eventually, provide them with appropriate support for childrearing.

Methods

An anonymous questionnaire survey was conducted on mothers raising a one-year-old infant, by using nine sub-scales and 110 scale items employed for "the draft CC Scale". The scale items were selected and determined by conducting a factor analysis and determining the I-T correlation after a primary component analysis for each of the sub-scale items. The internal consistency was evaluated by calculating Cronbach's α- and θ coefficients for each of the sub-scales. For the validity of the CC Scale, the constitutive concept validity was verified by examining the criterion-related validity using two external scales, then, the overall integrity of the scale was checked and the confirmative factor analysis was also conducted.

Results

The effective answers were received from 267 respondents. The α coefficient of the sub-scales varied from 0.961 to 0.663, and the difference between the credibility θ coefficient and the α coefficient was within the small range from 0.001 to 0.015. The CC Scale had a relatively strong correlation with both "Self-efficacy Scale on Childrearing" and "Sense of Coherence(SOC-13) Scale", thus, the criterion-related validity was confirmed. The CC Scale also had a relatively strong positive correlation with the nine sub-scales, which were shown to be categorized into three clumps, thus, the constitutive validity of the CC Scale was confirmed.

Conclusion

The CC Scale is a one-dimensionally structured scale consisting of 71 scale items under nine sub-scales, and its credibility and validity were duly verified.