Then the studies also suggested that career commitment had remarkable relations with some important effect variables, such as career satisfaction, job involvement, job performance.

研究发现，职业承诺与一些重要的效果变量有比较显著的关系，如职业满意度、工作投入、工作绩效等。

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Dr Hyde said gender differences accounted for either no or a very small effect for most of the psychological variables examined.

海德博士认为，性别差异对研究中所观察的大多数心理变量没什么影响，或者影响非常小。

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But the authors acknowledged that they could not account for all possible variables, and cautioned that it was an observational study that draws no conclusions about cause and effect.

不过，作者们承认未能一一证明所有可能的变化因素，并提醒这是项观察研究，不能就此得出这两者之间存在因果关系的结论。

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Fortunately, recently, professors Nick Bloom, Toby Kretschmer, and John van Reenen (from Stanford, the University of Munich, and the London School of Economics) conducted an extensive study examining the effect of family-friendly practices on hard variables such as firm sales per employee and return on capital employed, using a large database of firms from the US, the UK, Germany, and France.

FORBES: Are Family-Friendly Workplace Practices Worth Their Money? New Evidence