Table 3. Prevalence and 95% confidence intervals of double vision, itchy eyes and any ocular complaints during COVID-19 lockdown among schoolchildren age 12–19 years.

Variables	Double vision	F, sig.	Itchy eyes	F, sig.	Any ocular#	F, sig.
Socio-demographic factors
Age category, years
12–13	30.00 [17.57–46.28]	1.133, p = 0.336	45.45 [31.06–60.65]	1.682, p = 0.176	62.86 [50.46–73.76]	5.384, p = 0.002
14–15	32.11 [24.15–41.26]		43.05 [35.86–50.54]		76.02 [70.07–81.10]
16–17	32.05 [22.55–43.31]		44.44 [33.85–55.57]		79.28 [69.77–86.38]
18–19	48.15 [31.22–65.52]		61.22 [48.41–2.65]		94.83 [84.87–98.36]
Gender
Boys	25.83 [18.50–34.83]	4.719, p = 0.0355	40.65 [33.53–48.18]	5.860, p = 0.020	72.33 [66.94–77.14]	5.255, p = 0.027
Girls	41.09 [30.94–52.04]		52.20 [45.66–58.66]		82.27 [76.45–86.90]
Nature of community
Rural	27.78 [20.82–36.01]	5.124, p = 0.028	42.86 [34.78–51.34]	1.150, p = 0.288	72.07 [66.14–77.31]	6.549, p = 0.014
Urban	37.67 [30.32–45.64]		48.78 [42.05–55.56]		80.86 [77.08–84.15]
Ethnicity
Afro-Trinidad	33.33 [21.05–48.39]	0.364, p = 0.774	39.62 [27.54–53.12]	0.655, p = 0.573	76.71 [66.28–84.66]	1.532, p = 0.212
Indo-Tri	35.14 [25.29–45.14]		49.1 [40.67–57.59]		80.84 [74.47–85.92]
Mixed	34.29 [23.57–46.88]		47.83 [37.29–58.56]		75.00 [65.34–82.68]
Others	24.00 [10.24–46.63]		39.39 [23.98–57.26]		65.00 [49.86–77.62]
Year in school
Form 1–3	32.37 [25.41–40.21]	0.169, p = 0.683	43.48 [36.66–50.55]	1.238, p = 0.272	71.61 [66.66–76.09]	8.759, p = 0.005
Form 4–6	34.78 [25.55–45.32]		49.69 [41.60–57. 80]		83.92 [78.56–88.14]
Average daily hours spent on DD
<2 h	40.00 [24.10–58.33]	1.784, p = 0.160	32.00 [15.87–54.00]	1.954, p = 0.1292	69.44 [52.58–82.33]	1.261, p = 0.291
2–4 h	18.18 [6.58–41.20]		38.46 [23.27–56.29]		67.57 [50.35–81.06]
4–6 h	30.43 [22.36–39.93]		47.26 [40.96–53.65]		78.60 [74.79–81.97]
>6 h	42.03 [29.84–55.28]		50.54 [39.39–61.63]		80.00 [70.48–87.01]
Behavioural factor: Posture
Lying down
No	30.36 [24.85–36.50]	8.426, p = 0.005	43.42[38.23–48.76]	11.113, p = 0.001	76.58 [73.24–79.62]	0.817, p = 0.371
Yes	56.67 [36.88–74.53]		68.29 [54.09–79.74]		81.82 [70.31–89.53]
Sitting
No	45.45 [32.83–58.69]	6.283, p = 0.016	54.35 [44.27–64.08]	3.162, p = 0.082	79.83 [73.15–85.19]	0.711, p = 0.403
Yes	29.26 [23.29–36.03]		43.48 [37.40–49.76]		76.27 [72.09–79.99]
Sitting & Lying down
No	33.78 [27.19–41.07]	8.426, p = 0.005	46.93 [41.36–52.57]	11.113, p = 0.001	76.61 [73.32–79.60]	0.817, p = 0.371
Yes	31.03 [16.90–49.90]		41.67 [27.78–57.02]		82.61 [70.18–90.56]
Prevention strategies
Wears glasses
No	33.92 [26.88–41.75]	0.053, p = 0.818	45.33 [39.32–51.48]	0.234, p = 0631	76.57 [72.78–79.98]	0.817, p = 0.370
Yes	32.53 [23.14–43.58]		48.33 [38.28–58.52]		78.52 [71.17–84.41]
Interventions Treatment type
Spectacles	40.7 [30.94–51.25]	3.132, p = 0.052	52.94 [43.83–61.86]	7.648, p = 0.001	84.71 [79.34–88.88]	5.049, p = 0.009
Medications	43.48 [23.76–65.50]		72.97 [51.61–87.24]		77.55 [64.17–86.95]
None	27.59 [21.39–34.78]		37.04 [30.55–44.02]		72.05 [67.43–76.25]
Eye exam in the last year
No	28.99 [23.05–35.74]	9.078, p = 0.004	40.15[34.87–45.66]	21.518, p = 0.000	72.42 [69.35–75.3]	26.728, p < 0.001
Yes	53.19 [37. 15–68.60]		68.42 [57.22–77.83]		92.38 [86.44–95.85]
Took actions to resolve complaints
No	25.00 [19.24–31.81]	26.053, p < 0.001	39.66 [34.90–44.61]	14.41, p < 0.001	69.15 [65.09–72.94]	32.669, p < 0.001
Yes	52.56 [41.39–63.48]		60.18 [49.63–69.85]		94.29 [88.88–97.15]

Notes:

^#Any ocular symptom.

p–values are significant (sig.) from chi square test at 5%, F values are shown and the degree of freedom df = 42.