Table 2.

Concentrator repair and maintenance at 12, 24 and 40 months postimplementation of oxygen systems in 10 intervention hospitals and hours of concentrator use in each time interval

Hospital	Machines supplied, n	Concentrator repair and maintenance needs
		12 months			24 months		40 months
		Number needing repair, n(%)	Working after repair n (%)	Machines replaced n(%)	Number needing repair, n(%)	Working after repair n (%)	Number needing repair, n(%)	Working after repair n (%)
Northern provinces
H1P2	2	1 (50)	2	0	1	2	1	1
H2P2	3	0 (0)	3	2	0	3	0	3
H1P3	4	2 (50)	4	0	1	4	2	2
H2P3	4	1 (25)	4	0	1	3	1	3
Subtotal	13	4 (31)	13 (100)	2 (15)	3 (23)	12 (92)	4 (31)	9 (69)
Southern provinces
H1P1	4	2 (50)	3	2	1	4	2	2
H2P1	3	1 (33)	3	1	2	3	0	3
H1P4	4	4 (100)	3	2	1	4	2	2
H2P4	6	2 (33)	6	1	0	6	2	6
H1P5	4	1 (25)	3	1	0	4	2	3
H2P5	4	0 (0)	4	0	0	4	0	4
Subtotal	25	10 (40)	22 (88)	7 (28)	4 (16)	25 (100)	8 (32)	20 (80)
Total	38	14 (37)	35 (92)	9 (24)	7 (18)	37 (97)	12 (32)	29 (76)
Hours of use		13 465 (data available from 37/38 machines)			17 050 (38/38 machines)		17 839 (35/38 machines)