Table 7.

The association between socio-demographic variables and QOL domains (n = 343).

Variable	n	Physical health			Psychological well-being			Social relationship			Environmental support
		Mean rank	U Test	p value	Mean rank	U Test	p value	Mean rank	U Test	p value	Mean rank	U Test	p value
			Chi-Square statistics (df)			Chi-square statistics (df)			Chi-square statistics (df)			Chi-square statistics (df)
Age group (years)			7.460 (4)	0.113		16.994 (4)	0.002		16.994 (4)	0.002		5.110 (4)	0.276
≤ 30	115	182.82			187.98			187.98			165.19
31-40	120	154.25			151.51			151.51			196.41
41-50	62	173.11			163.55			163.55			167.41
51-60	34	180.44			176.90			176.90			199.38
≥ 61	12	210.50			253.58			253.58			209.55
Gender			10,665	0.704		9589	0.081		9589	0.081		10,671	0.709
Male	85	168.46			155.81			155.81			168.54
Female	258	173.16			177.33			177.33			173.14
Ethnic group			3.499 (3)	0.321		3.442 (3)	0.328		3.442 (3)	0.328		1.973 (3)	0.578
Malay	190	165.37			176.49			176.49			167.79
Chinese	90	172.71			157.46			157.46			174.66
Indian	52	187.74			174.30			174.30			175.07
Others	11	206.23			202.55			202.55			208.50
Marital status			9135	0.021		9789	0.135		9789	0.135		10,790	0.824
Married	258	164.91			167.44			167.44			171.32
Single	85	193.54			185.84			185.84			174.06
Current job position			4.789 (3)	0.188		9.319 (3)	0.025		9.319 (3)	0.025		5.087 (3)	0.166
Medical officer	64	164.66			142.24			142.24			169.22
Specialist	59	194.69			169.31			169.31			195.99
Nurse	121	173.99			188.58			188.58			161.39
Nurse with post-basic	99	160.79			172.57			172.57			173.76
Length of being Disaster relief volunteer (years)			10.663 (3)	0.014		30.056 (3)	0.000		30.056 (3)	0.000		14.788 (3)	0.002
≤ 1	80	201.18			213.37			213.37			196.31
2-5	190	161.66			154.32			154.32			160.56
6-9	49	157.31			147.40			147.40			153.36
≥ 10	24	186.60			224.29			224.29			219.58
Formal course on disaster management			12,973	0.126		13,153	0.182		13,153	0.182		12,564	0.047
Yes	145	181.53			182.29			182.29			184.35
No	198	165.02			165.93			165.93			162.95
Attended debriefing session in disaster relief work			13,891	0.900		13,808	0.827		13,808	0.827		12,763	0.163
Yes	209	172.54			172.93			172.93			177.94
No	134	171.16			170.54			170.54			162.74
if yes, indicate the time of the debriefing (n = 209)			5.129 (2)	0.077		2.658 (2)	0.265		2.658 (2)	0.265		5.802 (2)	0.055
During trip	53	96.86			105.55			105.55			104.47
Post trip	98	100.48			98.80			98.80			96.29
Both	58	120.04			114.97			114.97			120.20
Frequency of involvement in Disaster relief work			2.289 (3)	0.515		0.502 (3)	0.918		0.502 (3)	0.918		2.749 (3)	0.432
1 time	179	165.82			159.21			159.21			160.76
2–5 times	153	154.77			165.96			165.96			159.09
6–9 times	6	149.54			156.93			156.93			168.58
≥10 times	5	190.83			168.83			168.83			208.67

QOL: quality of life.