What reduces loneliness? Interventions and study design

Step 1 Warm-up recall

From M4.L4: write the formula for adherence and say why a dose log matters.

Your answer

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Step 2 Learning goal

By the end of this lesson you can:

• name four types of loneliness intervention (Foundation);
• explain why weaker designs can give larger effects (Core);
• calculate your adherence so far and record a mid-experiment check (Core).

Step 3 A familiar example

A club offers a coffee morning for lonely residents. Attendance is good and everyone says it was lovely. But those who came may already have been the most willing to connect, and there is no comparison group.

Step 4 Clear explanation

Masi, Chen, Hawkley and Cacioppo (2011) meta-analysed 50 studies of interventions to reduce loneliness: 12 single-group before-and-after studies, 18 non-randomized comparisons and 20 randomized comparisons. They grouped interventions by approach: improving social skills, enhancing social support, increasing opportunities for social contact, and addressing maladaptive social cognition. Among the randomized comparisons, interventions that addressed maladaptive social cognition were the most successful, which the authors said fits current theories of loneliness. Single-group and non-randomized studies produced larger mean effect sizes than randomized ones.

Why do weaker designs give larger effects? Without a comparison group, change over time (people feel better anyway, or an enthusiastic start fades) is counted as treatment. That is why Module 1 and Module 3 insisted on comparison groups and why your own experiment is a small trial of one.

Mid-experiment check. Halfway through your four weeks, count the days you did the habit, calculate adherence, and note the mean of your daily ratings so far. Do not change the habit or the decision rule.

Step 5 Worked example (4 marks)

Your log shows 13 days done out of 14 planned, with mean ratings of 5.6 (baseline mean 5.4).

1. Adherence = 13 ÷ 14 = 0.929, so 93%. (1 mark)
2. Change so far = 5.6 − 5.4 = 0.2. (1 mark)
3. It is too early to apply the decision rule, which uses weeks 3 and 4. (1 mark)
4. Record the check and keep going, changing nothing. (1 mark)

Step 6 Learner practice (instant-marked)

Step 7 Recap

• Masi and colleagues (2011): 50 studies; four approaches; social-cognition approaches did best among randomized studies.
• Weaker designs gave larger mean effects than randomized ones.
• Check adherence halfway and change nothing.

Step 8 Exit ticket (ungraded)

Write your halfway check: days done, planned days, adherence and mean rating.

Your answer

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Step 9 Go further (Extension)

Read the Masi and colleagues abstract. Note what the authors suggest about future programmes.