Table 4

Risk Factors for Pandemic (H1N1) 2009 Virus Seroconversion among Hospital Staff, Singapore

Mark I.C. Chen

, Vernon J.M. Lee, Ian Barr, Cui Lin, Rachelle Goh, Caroline Lee, Baldev Singh, Jessie Tan, Wei-Yen Lim, Alex R. Cook, Brenda Ang, Angela Chow, Boon Huan Tan, Jimmy Loh, Robert Shaw, Kee Seng Chia, Raymond T.P. Lin, and Yee Sin Leo

Author affiliations: Author affiliations: Tan Tock Seng Hospital, Singapore (M.I.C. Chen, R. Goh, C. Lee, B. Singh, J. Tan, B. Ang, A. Chow, Y.S. Leo); Duke-National University of Singapore Graduate Medical School, Singapore (M.I.C. Chen); Ministry of Defence, Singapore (V.J.M. Lee); World Health Organization Collaborating Centre for Reference and Research on Influenza, Melbourne, Victoria, Australia (I. Barr, R. Shaw); National Public Health Laboratory, Singapore (C. Lin, R.T.P. Lin); National University of Singapore, Singapore (W.-Y. Lim, A.R. Cook, K.S. Chia); DSO National Laboratories, Singapore (B.H. Tan, J. Loh)

Main Article

Comparison of risk factors among allied health staff, ward-based nurses, and non–ward-based nurses for exposures to pandemic (H1N1) 2009, mask use, and work-related contacts, Singapore, 2009*

Risk factor	1: Allied health staff, n = 116	2: Non–ward-based nurses, n = 103	3: Ward-based nurses, n = 187	p values†
Risk factor	1: Allied health staff, n = 116	2: Non–ward-based nurses, n = 103	3: Ward-based nurses, n = 187	2 vs. 1	3 vs. 1	3 vs. 2
Seroconverted in study period, %	2 (0–6)	8 (4–15)	11 (7–16)	0.05	<0.01	0.53
Mean age, y	32 (30–33)	34 (32–36)	32 (31–34)	0.14	0.81	0.21
Mean household size	4.8 (4.4–5.1)	4.8 (4.4–5.2)	5.5 (5.1–5.8)	0.96	<0.01	0.01
Household members with FRI in the following age groups, %
0– 4 y	3 (1–7)	3 (1–8)	2 (1–5)	1.00	1.00	0.70
5–12 y	2 (0–6)	4 (2–10)	1 (0–4)	0.42	0.64	0.19
13–19 y	1 (0–5)	3 (1–8)	2 (1–5)	0.34	0.65	0.70
Masks for patient care all or almost all the time, %	64 (53–74)	71 (59–80)	69 (61–77)	0.48	0.54	0.87
Valid responses‡	76	69	130
Received seasonal influenza vaccine, %	84 (77–90)	91 (84–95)	96 (92–98)	0.15	<0.01	0.19
Geometric mean no. colleagues in work area	27 (24–31)	48 (39–59)	23 (20–25)	<0.01	0.05	<0.01
Valid responses‡	101	89	147
Geometric mean no. patient contacts per day	15 (12–18)	37 (26–52)	19 (17–22)	<0.01	0.03	<0.01
Valid responses‡	73	59	127
Geometric mean no. visitor contacts per day	12 (9–15)	28 (21–38)	15 (13–18)	<0.01	0.04	<0.01
Valid responses‡	75	58	133
Occupational-related exposures, %
Direct patient contact	84 (77–90)	91 (84–95)	99 (97–100)	0.15	<0.01	<0.01
Contact with patients who had pandemic (H1N1) 2009	14 (9–21)	19 (13–28)	41 (34–48)	0.28	<0.01	<0.01
Contact with colleague(s) who had pandemic (H1N1) 2009	2 (0–6)	15 (9–23)	14 (10–20)	<0.01	<0.01	0.86

*Values in parentheses are 95% confidence intervals. FRI, febrile respiratory illness.
†p values by Fisher exact test for proportions and unpaired Student t test for means.
‡Based on participants who answered this questionnaire item; all other analyses are based on no. participants in that occupational subgroup.

Main Article

Page created: September 07, 2011

Page updated: September 07, 2011

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