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Figure 2 | BMC Public Health

Figure 2

From: Cardiorespiratory fitness, cardiovascular workload and risk factors among cleaners; a cluster randomized worksite intervention

Figure 2

Randomization procedure, multilevel design. The clusters are randomised into either reference (R) or intervention group (I). Stratum (A, B, C) are defined by the manager the participant reports to. Clusters are formed from geographical work location, gender, age and seniority. Clusters are paired according to number of participants, gender, age and seniority.

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BMC Public Health

ISSN: 1471-2458

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