Table 5 Parasitic infections in relation to the physicochemical parameters of collected water samples

Seasonal variation

Wet

34

22

64.7

1.000

0.147

Dry

44

35

79.5

2.121 (0.768–5.856)

Bather load

< 250

48

32

66.7

1.000

0.113

250–500

30

25

83.3

2.500 (0.806–7.757)

Depth of sampling

Superficial

39

33

84.6

3.437(1.164–10.152)

0.025^*

Deep

39

24

61.5

1.000

Temperature

< 27 °C

20

12

60.0

1.000

0.132

≥ 27 °C

58

45

77.6

2.308 (0.778–6.842)

Duration of swimming pool work (in hours/ day)

≤ 10

46

30

65.2

1.000

0.067

> 10

32

27

84.4

2.880 (0.930–8.923)

Frequency of cleaning the swimming pools

Every 48 h.

20

19

95.0

10.0 (1.246–80.245)

0.030^*

Daily^$

58

38

65.5

1.000

Turn over (h)

< 6

56

39

69.6

1.000

0.281

6^$

22

18

81.8

1.962 (0.577–6.671)

Flow rate (m3/min)

< 80^$

24

9

37.5

1.000

< 0.001^*

≥ 80

54

48

88.9

13.333(4.078–43.59)

Cl ₂ (1-1.5 ppm)

1-1.5^$

22

9

40.9

1.000

< 0.001^*

> 1.5

56

48

85.7

8.667(2.793–26.896)

pH (7.2–7.8)

< 7.2

69

51

73.9

1.417(0.320–6.26)

0.646

7.2–7.8^$

9

6

66.7

1.000

Alkalinity (100–150 mg/l)

100–150^$

25

17

68.0

1.000

0.489

Abnormal

53

40

75.5

1.448(0.508–4.128)

TDS (< 1500 ppm)

< 1500^$

59

39

66.1

1.000

0.037^*

≥ 1500

19

18

94.7

9.231(1.148–74.22)

Total hardness (200–400 mg/l)

200–400^$

35

20

57.1

1.000

0.006^*

> 400

43

37

86.0

4.625(1.552–13.78)

Total

78

57

73.1