Methods The methods of systematic pretest and individual pretest were adopted.

方法采用植物化学成分系统预试法和专项预试法。

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CONCLUSION: the 4 kinds of individual changing trends in pretest-posttest design show the problem of the individual change can't be ignored when we analyze the data of pretest-posttest design.

结论：总结了前后测量设计资料个体生长趋势的4种情况，提示我们在分析前后测量设计资料时个体自然生长问题不容忽视。

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CONCLUSION: the 4 kinds of individual changing trends in pretest-posttest design show the problem of the individual change can't be ignored when we analyze the data of pretest-posttest design.

结论：总结了前后测量设计资料个体生长趋势的4种情况，提示我们在分析前后测量设计资料时个体自然生长问题不容忽视。

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