Self-rated quality of life and school performance in relation to helminth infections: case study from Yunnan, People's Republic of China

Table 4 Mean EQ-VAS scores, including standard deviation (SD) and A. lumbricoides, hookworm and T. trichiura infection, together with the scores of the negative control groups among 252 children visiting two schools in Yunnan province, P.R. China.

Parameter	Obs.	Mean EQ-VAS score	SD	95% CI	Min. score	Max. score	P-value^a
A. lumbricoides
Bulangshan
Non-infected	49	66.4	19.8	60.7, 72.1	28	98	0.655
Infected	105	64.8	22.3	60.5, 69.2	0^b	100
Pu'er
Non-infected	89	70.5	18.4	66.7, 74.4	18	100	0.777
Infected	9	68.3	19.0	53.7, 82.9	35	90
Hookworm
Bulangshan
Non-infected	36	67.3	22.8	59.5, 75.0	0^b	100	0.375
Infected	118	64.8	21.1	61.0, 68.6	25	100
Pu'er
Non-infected	67	70.5	18.5	66.0, 75.0	18	100	0.757
Infected	31	69.9	18.2	63.3, 76.6	39	100
T. trichiura
Bulangshan
Non-infected	46	64.3	20.5	58.2, 70.3	27	94	0.787
Infected	108	65.8	22.0	61.6, 70.0	0^b	100
Pu'er
Non-infected	83	69.7	18.9	65.6, 73.8	18	100	0.445
Infected	15	74.0	15.1	65.6, 82.3	50	100

^a P-values according to the Kruskal-Wallis test with 1 d.f.
^b 0 equals to death in EQ-VAS but some children presumably did not understand the question and answered 0.
CI, confidence interval; SD, standard deviation

ISSN: 1756-3305