Table 1 Definitions of variables describing the occurrence and variation of postures in the present study.

   LEV1

Proportion of total time in seated posture (%)

Frequency

   FREQ1

Frequency of switches from seated to standing/walking or vice-versa (h^-1)

   FREQ2

Average duration of uninterrupted periods seated (min)

   FREQ3

Average duration of uninterrupted periods standing/walking (min)

   FREQ4

Proportion of total time in uninterrupted periods seated longer than one hour (%)

   FREQ5

Proportion of total time in uninterrupted periods standing/walking longer than one hour (%)

Similarity

   SIM1

Coefficient of variation (SD/mean); durations of periods seated

   SIM2

Coefficient of variation (SD/mean); durations of periods standing/walking

   SIM3

Correlation between the duration of periods seated and the following period standing/walking^a

Criteria basis for compliance with guidelines

   CRIT1

Average time until 5 minutes of standing/walking have been accumulated (min)^{a; b}

   CRIT2

Average time until 5 minutes of uninterrupted standing/walking have been obtained (min)^{a; b}

   CRIT3

Average time until 10 minutes of standing/walking have been accumulated (min)^{a; b}

   CRIT4

Average time until 10 minutes of uninterrupted standing/walking have been obtained (min)^{a; b}

   CRIT5

Proportion of total time when standing/walking has not occurred for 5 accumulated minutes during the previous hour (%)^c

   CRIT6

Proportion of total time when standing/walking has not occurred for 5 uninterrupted minutes during the previous hour (%)^c

   CRIT7

Proportion of total time when standing/walking has not occurred for 10 accumulated minutes during the previous hour (%)^c

   CRIT8

Proportion of total time when standing/walking has not occurred for 10 uninterrupted minutes during the previous hour (%)^c