Exploring factors affecting individual GPS-based activity space and how researcher-defined food environments represent activity space, exposure and use of food outlets

Table 5 Overlap between RDFE and AS

RDFE		Mean AS (km²)	Mean overlap (km²)	% mean overlap	Mean difference	95% CI for difference		% mean difference	p-value
Type	Size	Mean AS (km²)	Mean overlap (km²)	% mean overlap	Mean difference	Lower	Upper	% mean difference	p-value
CBH	2 km	59.54	9.87	16.6	49.67	36.09	63.27	83.4	< 0.001*
	4 km	59.54	21.96	36.9	37.58	24.65	50.51	63.1	< 0.001*
	6 km	59.54	31.07	52.2	28.47	16.78	40.16	47.8	< 0.001*
CBW	2 km	59.54	8.66	14.5	50.88	37.18	64.59	85.5	< 0.001*
	4 km	59.54	19.08	32.0	40.46	27.34	53.59	68.0	< 0.001*
	6 km	59.54	28.88	48.5	30.66	18.76	42.58	51.5	< 0.001*
CBHW	2 km	59.54	16.35	27.5	43.19	29.94	56.45	72.5	< 0.001*
	4 km	59.54	31.42	52.8	28.12	16.48	39.78	47.2	< 0.001*
	6 km	59.54	40.61	68.2	18.93	9.59	28.27	31.8	< 0.001*
SNBH	2 km	59.54	5.08	8.5	54.46	40.75	68.18	91.5	< 0.001*
	4 km	59.54	15.22	25.6	44.32	30.79	57.85	74.4	< 0.001*
	6 km	59.54	24.07	40.4	35.47	22.65	48.3	59.6	< 0.001*
SNBW	2 km	59.54	4.67	7.8	54.87	41.26	68.49	92.2	< 0.001*
	4 km	59.54	13.84	23.2	45.70	32.32	59.09	76.8	< 0.001*
	6 km	59.54	22.65	38.0	36.89	24.21	49.58	62.0	< 0.001*
SLB	2 km	59.54	24.24	40.7	35.30	23.54	47.08	59.3	< 0.001*
	4 km	59.54	36.66	61.6	22.88	12.79	32.97	38.4	< 0.001*
	6 km	59.54	35.47	73.1	16.01	7.61	24.4	26.9	< 0.001*
2 SDE		59.54	35.47	59.6	24.07	18.41	29.74	40.4	< 0.001*

N = 60, RDFE Researcher-Defined Food Environment, AS Activity space CBH Circular Buffer around Home, CBW Circular Buffer around Workplace, SNBH Street Network Buffer around Home, SNBW Street Network around Workplace, SLB Straight-line Buffer, 2 SDE 2 Standard Deviational Ellipse. Note, CBHW is a union of circular buffers around home and workplace and not a sum of individual circular buffers

ISSN: 1476-072X