. 2015 Jun 12;15:548. doi: 10.1186/s12889-015-1892-1

Table 3.

Groups of asymptomatic healthy women attending Malaysian Mammographic study using the cluster analysis (N = 989)

	Cluster 1		Cluster 2		Cluster 3		P-value
	N = 451		N = 262		N = 276
	Mean	sd	Mean	sd	Mean	sd
Age (years)^a	52	6.0	45	5.0	51	8.0	<0.001
Age at first mammogram (years)^a	44	6.0	45	5.0	50	7.0	<0.001
Age at first live birth (years)^a	28	4.0	29	4.0	25	5.0	<0.001
	N	%	N	%	N	%
Previous mammogram status^b
Never had a mammogram before	0	0.0	258	98.5	259	93.8	<0.001
Have had a mammogram before	451	100.0	4	1.5	17	6.2
Education level^b
Primary	9	2.0	0	0.0	54	19.6	<0.001
Secondary	222	49.2	66	25.2	219	79.3
Tertiary	220	48.8	196	74.8	3	1.1
Monthly income (RM)^b
Below 5 k	180	39.9	36	13.7	236	85.5	<0.001
5 k to 10 k	164	36.4	127	48.5	37	13.4
Above 10 k	107	23.7	99	37.8	3	1.1
Family history of breast cancer^b
None	392	86.9	237	90.5	261	94.6	0.009
1 affected individuals	54	12.0	25	9.5	14	5.1
2 affected individuals	5	1.1	0	0.0	1	0.4
HRT Usage^b
Never	384	85.1	255	97.3	259	93.8	<0.001
Ever used	67	14.9	7	2.7	17	6.2
BMI^b
Underweight	8	1.8	6	2.3	6	2.2	0.001
Normal weight	264	58.5	162	61.8	126	45.7
Overweight	179	39.7	94	35.9	144	52.2
Diabetes status^b
Unaffected	420	93.1	255	97.3	235	85.1	<0.001
Affected	31	6.9	7	2.7	41	14.9
Motivators for first mammogram^b
Family & Friends	147	32.6	52	19.8	25	9.1	<0.001
Doctor	92	20.4	75	28.6	119	43.1
Myself	67	14.9	16	6.1	23	8.3
Public campaign	60	13.3	34	13.0	14	5.1
More than 1 motivators	37	8.2	23	8.8	17	6.2
No motivators	48	10.6	62	23.7	78	28.3

^aIndicates continuous variable

^bIndicates categorical variable