. Author manuscript; available in PMC: 2017 Jun 2.

Published in final edited form as: Eur Respir J. 2013 Mar 21;43(1):185–194. doi: 10.1183/09031936.00198012

TABLE 1.

Demographics and indication for referral in patients undergoing sputum induction stratified by patient setting and HIV status

	All	Outpatients	Inpatients	p-value^#	HIV infected	HIV uninfected	HIV status unknown	p-value^#
Subjects	696	262	434		308	186	202
Age years	40 (32–53)	45 (34–57)	38 (29–48)	<0.001	35 (30–42)	46 (36–56)	49 (33–61)	<0.001
Females	408 (58)	152 (58)	256 (59)		192 (62)	98 (53)	118 (58)	NS
CD4 cell count^¶ cells·μL⁻¹	155 (65–269)	185 (74–290)	146 (60–262)		155 (65–269)	NA	NA	NS
Reason for referral to undergo sputum induction
Sputum scarce⁺	517 (74)	208 (79)	309 (71)	0.02	228 (74)	133 (72)	156 (77)
Two smear-negative samples	179 (26)	54 (21)	125 (29)	0.02	80 (26)	53 (28)	46 (23)

Data are presented as n, median (interquartile range] or n (%), unless otherwise stated. NA: not applicable; NS: not significant (p>0.05).

: significant differences between different patient groups;

^¶

: 74 HIV-infected patients had missing CD4 cell count data;

⁺

: unable to produce sputum.